Maldives

Desktop Applications

Windows

Ada - Ada is the perfect little Twitter app with a clean, simple design. It doesn't hog up your desktop or distract you with a million crazy features. See and send tweets, replies and direct messages. Ada runs on both PCs and MACs.
AlertThingy - AlertThingy v2 brings the very latest updates from your favourite social networks direct to your desktop. Plus send Tweets, update your Facebook status, upload photos to Flickr, post to Tumblr and more. With v2 AlertThingy makes it faster and easier to manage the online you. Plus you get the coolest looking RSS reader on the interweb.
BigTweet - BigTweet installs as a bookmarklet and allows you to post to Twitter from any web page. Choose a classic 140 character update, or a 240 character tweet. Insert special Unicode characters and shorten URLs with the Bit.ly API right from the bookmarklet window. Automatically capture the current page title, URL and any highlighted text. No registration is required - only Twitter login credentials are needed.
Bitter - A free social networking client that supports Twitter, Friend Feed, Plurk and Pownce. It is fully featured including the ability to follow hash tags, do Twitter searches, auto-shorten URLs, has color schemes, spell checking, intellisense, and lots more.
BMS Twitter Client - A Windows Twitter Client written in VB .NET based on work by the Yedda Dev Blog. Just unzip and run the executable. Automatically breaks long messages into pieces, including replies. Uses Google to translate your language into one or more other languages - additional multilingual support can be added. New updated version coming soon! By myklami
BMS Twitter Export: - A Windows Twitter Application that exports all Tweets for a given Twitter Account within a given date range to an HTML file and also downloads associated twitpic images. A bit heavy on the API calls so avoid calling it repeated within a given hour. By myklami
Chirrup - A simple Windows client for Japanese
Digsby - A multiprotocol IM client that lets you manage all your IM, email, and social network accounts from one easy-to-use application. For IM, it brings all your buddies into one merged contact list with support for AIM, MSN, Facebook, Yahoo, ICQ, GTalk, and Jabber. For email, it offers notifications of new emails with message previews, as well as, the ability to perform actions such as "Mark as Read" and "Delete" right from the notification with support for Gmail, Hotmail, Yahoo Mail, AOL/AIM Mail, POP, and IMAP. For social networks, it provides a newsfeed of events on the network and the ability to set status with support for Facebook, Twitter, and MySpace.
DX Monitor - An amateur radio application to report worldwide DX activity and alert amateurs to activity from rare countries. Alerts and status reports can be automatically tweeted based on reception reports from DX Summit and telnet links to DX Clusters.
FAROO - A Peer-to-peer Web Search Engine, that integrates Twitter search to discover discussions and people related to the query.
feedalizr - A free deskptop application that allows you to view, rate and comment on what your friends are sharing online. Tweet, upload pics to Flickr, update your Facebook status, keep up to date with your friends’ Google Reader, Digg, Tumblr, YouTube and Last.fm posts on Friendfeed. Use unique filters to reduce the noise. Duplications are filtered out. -- by MIH SWAT
Flotzam - A Mash Up of Twitter, Flickr, Facebook and blogs, completely configurable -- by Karsten Januszewski and Tim Aidlin
Found.im - The Twitter/Facebook client for the person always on the move! Automatically tracks your location (Home, Work, Starbucks, etc.) and combines the information with status updates. Super discreet interface that doesn't bombard you with messages. Microblog and get back to what you were doing. Check out the intro video.
Friendbar- A Firefox toolbar that is the best way to follow Twitter & Facebook updates, and post to Twitter and Facebook
GeoTweeter - Puts the 'where' into your tweets! Messages automatically include a 'schmap.me' link, showing followers your exact location with a configurable map icon: say more about places you visit with an optional photo and star rating.
JabberTwitterBridge -- Java application to update Twitters, Jabber's status (google talk gtalk) and Google calendar together (for example : In a meeting until 15h12) (Twitter to google talk, google talk to twitter, google calendar to google talk and google calendar to twitter) MrCba
jata - jata stands for just another Twitter App. Jata is a Google Talk like Twitter Application which was developed using VB.net and Twiteroo Twitter API framework. This application automatically checks for new messages periodically. You can post your status right from jata post message screen. You can also reply to tweets using this windows application.
KlipFolio - World's smallest personal dashboard to track Twitter Updates, with instant notifications.
L0K8 - a tiny app that auto-updates your Twitter location when you move from place to place. Written by the founder of PBwiki, David Weekly.
MadTwitter -- a clon of Twitterrific for Windows which doesn't require .NET -- by Sacha Fuentes
Media Center Status Application - Updates your Twitter status according to what you do in Windows Media Center and displays your Twitter friends' status updates in Media Center. Requires Windows Vista or 7. By Jussi Palo
Nearby tweets - Find twitterers nearby (or anywhere for that matter). Add to the fun by searching new locations and using keywords. By Brian Cray
OutTwit - OutTwit (Outlook + Twitter = OutTwit) Use Twitter from Outlook.
Post To Twitter - Post tweets from Microsoft Excel. VBA-based add-in for Excel 2000-2007.
Public Timeline Screensaver - Screensaver that shows the public timeline.
Pwytter - Free open source Twitter client written in Python by PJ Coudert. User Interface in 14 languages.
QckTwit -- A simple Twitter app that you can activate anytime by Shift+Alt+T and it would pop up presenting a text box to enter your update quickly. As soon as you press Ctrl+Enter, it will send update to Twitter and get out of your way. Separate box for URL. If your message exceeds Twitter's limit then it will automatically break it down in multiple twits and color those extra chars differently. Open source, requires .Net 3.5 -- by Shital Shah
QKTwit - Super lightweight Twitter client, Written on the Abobe AIR Platform, aims to be feature rich but small and low memory footprint. By Daniel Rivers
sociagami -- sociagami allows you to manage your multiple social network statuses from one beautiful Windows application. sociagami currently supports Myspace, Facebook, and Twitter status.
StickyTweets - An open source, lightweight client written in Win32 C/C++ for Windows XP SP2 or greater. No additional frameworks required. By MrTyzik
TeleTwitter - A Windows Twitter application that tries hard to be simple and beautiful, like its web 2.0 name sake.
Threeter Open source Twitter client that makes updating your status easy as 1-2-3: press the hotkey combination, enter your message, press Enter. Easy and really fast, worth a try :-) by Devv
Togi Twitter Client (Update) -- Togi is developed on .NET 2.0 with C# and is a open source software by Oguzhan
triQQr -- Twitter Client for Windows v0.2 with posting, profiles, direct messages and link to homepage of user
TheTwitterBot -- Twitter client for windows. It is an automated robot that can follow by keyword new friends, can stop follow those who don't follow, can update your status by your pre-made messages, can follow those who follow you, can send massive DM, can auto reply to those you follow, etc.
Twadget - A Windows Vista sidebar gadget by Rod Begbie
TwApp! for Windows -- by Harper Reed (Requires .NET 2.0)
Twair a twitter desktop client powered by extjs & adobe air
Tway a simplistic windows client which doesn't disturb you so much
Tweet-SQL is a Twitter Client for Microsoft SQL Server 2005 and above. Over 30 procedures allow you to leverage the Twitter API with standard TSQL.
Tweet All About It! -- Tweet any snippet of text directly from your browser (Internet Explorer and Firefox supported). By iElectrify (@sherice on Twitter)
Twessenger -- a Twitter add-in for Windows Live Messenger 8.1. Sets your personal message to your latest tweet! -- by Kunal Kundaje
Twibble for the desktop is a twitter client built on top of the new Adobe AIR platform. It provides easy twitter access in a user friendly way.
Twidget for Konfabulator/ Yahoo! Widgets Post from your desktop.
TwiPing Twitter Contact Management Software. Follow and unfollow large batches of friends and followers with a single click.
Twit4Live -- A Messenger Plus! Live Script that adds twitter interaction to Windows Live Messenger
Twit4Trivia -- A trivia application for twitter featuring more then 64000 questions and various statistics.
Twitter Thingy - A very simple Adobe air based Twitter client for windows, OS X and Linux. It has all the essential functions that get you using the best parts of Twitter as quickly as possible, without having to learn a colossal new bit of software. It also does groups and archiving as well as threaded replies.
Twitsy - Twitsy is a open source, VB.NET Application which shows basic integration of twitter API and .NET Framework 2. -- by rui(JumpByte)
Twitter CLI - Easy to use Command Line Interface allows submitting tweets to Twitter from the Windows CMD Prompt or 'Run' box -- by Jason Fowler.
Twitter Desktop - A How-To for making TwitterVision your desktop background, watch live tweets while working.(not an app)
Twitter Gadget - A Windows Vista Desktop Sidebar Gadget that helps you keep track of all the sweet tweets! Fetches tweets from twitter.com and updates them every 10 seconds.
Twitter It! - A Windows .NET Desktop Application created by Travis James, currently on Version 1.0.
Twitter Submitter - now available. For Windows 95/98/2k/XP (tested) Submit Twitterings to Twitter.com without using a web browser! Submit Private messages as well! (D username message)Kenneth Udut (simplify3@aol.com)
Twitter-Sync (Yahoo Messenger Plugin) - Keeps your Yahoo! Messenger status and Twitter in synchronization. Update your Yahoo! Status to create a new tweet. Your new tweets update your Yahoo! status. Also keeps track of your twitter friends from the main messenger window with alerts, pop-ups + more... -- by WackyB.
Twitterbox -- Twitter client for Windows made with beon widget technology.
TwitterIM -- Get/post updates on twitter using your google chat account (gtalk). Works just like Twitter IM functionality which is currently disabled. Sends message to you on chat if you friends post updates. You can message it and it will update your twitter status. By itsfrosty.
Twitterlicious -- Twitterlicious is a small app that makes using Twitter more fun. It handles all the hard work, leaving you to read and write tweets with the minimum fuss. Best of all, *Twitterlicious is free*!
Twitterlights -- Twitterlights is an integrated feature of i-Lighter 2.1 allowing one-click tweeting and content saving with your mouse -- all free!
Twitteroo 1.4 for Windows released on 13 March 07 (by RareEdge Design Group) - *new* features include font resizing, transparency, sound notifications, built-in URL shortening. Programmable API!
TwitterYM - a tiny ruby script that updates your Yahoo Messenger status with your latest Twitter one (requires Windows and Ruby) - by Alex Brie
Twittget Twitter Vista Gadget, that features a small docked mode, a large float mode and Direct Messaging support. by mayu
TwittIt - A system tray application for easy posting to Twitter by Denis Briel
Twittle - A lightweight Twitter client for Windows (XP, Vista). Clean un-cluttered UI written in WPF. Updates automatically. by Twittle.
TwittMe! - A new Twitter Windows Client 1.0.4. Updates itself directly without user input, keeping it always as bug free as possible. Will open source it when client it's more feature complete.
TwitTray -- A minimalist approach to a desktop Twitter status updater. The program sits silently in your system tray until you want to update your Twitter status. Very tiny and written in old school bulletproof C++/MFC. By kwitcherbitchen.org.
Twtview 1.4 NEW FEATURES: 'pm' lets you see your private messages, 'u twittername' will show any public users homepage. (Jan 27 07). For Win32. View all public timelines and personal timeline without needing web browser. Can be used at the same time as Twitter Submitter W32 to instantly see your submissions. Kenneth Udut
Visual Twit -- a simple Twitter posting client for Windows -- by Andy
Witty -- A Twitter client for Windows Vista and XP powered by the Windows Presentation Foundation (WPF) by Alan Le
WittyTweets -- A cute Twitter client for Windows Vista and XP by Tweet Feeds
Yakkle! - A free application that integrates together a twitter client, IM client, multi-user voice conferencing, and group desktop sharing services. -- by ZenViva
TweetIE - CloudBerry TweetIE is a Twitter plug-in for IE that helps you to post quotes from the websites you visit with a click of the button and attach a short Chilp.IT URL to the source page.
pbtweet - bookmarklet enhancer for twitter.com on Safari and Chrome. pbtweet shows conversation chain, media badge and RT/via buttons. Other feature: Automatically update timeline. Automatically adding next page when scrolling down to bottom up to 40 pages stable. Many interaction are animated with using CSS3. -- by t_trace
Twitter Post for foobar2000 - This is a plug-in of the audio player named foobar2000. This plug-in posts now playing track information to Twitter automatically. -- by kitahei

Mac

Ada - Ada is the perfect little Twitter app with a clean, simple design. It doesn't hog up your desktop or distract you with a million crazy features. See and send tweets, replies and direct messages. Ada runs on both PCs and MACs.
AlertThingy - AlertThingy v2 brings the very latest updates from your favourite social networks direct to your desktop. Plus send Tweets, update your Facebook status, upload photos to Flickr, post to Tumblr and more. With v2 AlertThingy makes it faster and easier to manage the online you. Plus you get the coolest looking RSS reader on the interweb.
Airmailr - A full-featured Mac OS X dashboard widget for Twitter
BigTweet - BigTweet installs as a bookmarklet and allows you to post to Twitter from any web page. Choose a classic 140 character update, or a 240 character tweet. Insert special Unicode characters and shorten URLs with the Bit.ly API right from the bookmarklet window. Automatically capture the current page title, URL and any highlighted text. No registration is required - only Twitter login credentials are needed.
Blogo - A weblog editor which is also a full-featured Twitter client integrated with Twitpic, tinyURL, tweetburner and Ping.fm.
Bluebird - A simple and beautiful twitter client by {13Bold}. Bluebird has support for html/css themes and works great for updating multiple accounts!
Celly. OS X. The original Twittergotchi as a downloadable app by Chris Messina
Chirp v.5. OS X. Dashboard Widget for Twitter, FriendFeed, Identi.ca, and Pownce by Warm Chocolate.
Chitter. OS X. Plug-in for iChat by ROFL Software
EventBox. OS X. Social network aggregator with full support for Twitter (searching, etc).
feedalizr - A free deskptop application that allows you to view, rate and comment on what your friends are sharing online. Tweet, upload pics to Flickr, update your Facebook status, keep up to date with your friends’ Google Reader, Digg, Tumblr, YouTube and Last.fm posts on Friendfeed. Use unique filters to reduce the noise. Duplications are filtered out. -- by MIH SWAT
Friendbar- A Firefox toolbar that is the best way to follow Twitter & Facebook updates, and post to Twitter and Facebook
iChat Status to Twitter. Applescript that pushes your iChat status, including iTunes current song by WT Leroux
iTunes to Twitter. Applescript that pushes out your iTunes current song by WT Leroux
MoodBlast. Updates Twitter (and Facebook, Jaiku, Tumblr, Yappd, iChat, Adium, Skype) from a hotkey with extensive replacement strings.
NatsuLion - NatsuLion is a simple native Twitter client for Mac OSX with ability to view only @replies.
Nambu - Free desktop application that combines Twitter, FriendFeed, Twitter Search and tr.im URL shortening together into a great streamlined experience.
P3:PeraPeraPrv for Mac - P3: PeraPeraPrv for Mac is fully functional twitter client based on Java. P3 supports full-keyboard based operation, filter view to tracking with @id's and keyword, quick-appearance changing, English/Japanese/Chinese interface and many features.
PhotoTwitter. This application allows you to take a Snapshot using your iSight and post the photo and your text on Twitter.
pocket* - A refreshingly simple twitter client by the author of TwitterPod.
Pwytter - The free open source Twitter client written in Python now packaged as an App
RAILhead Design. Wiki page. UPDATED TO v1.3.2 on 02-23-2007.
Robin. OS X Dashboard Widget by SimplyExcited.
Scalaris - OS X. Built as minimal and unintrusive as possible. Relies on Growl.
TikiTwit . Updates your Twitter status when you change your iChat status.
Tototl 1.4 - An opensource and lightweight Twitter Client for Mac OSX in Cocoa
Twidget. OS X. Twitter Dashboard by Aquabox
Twitgit. OS X. Dashboard Widget by Ben Ward (See also Wiki Page)
Twits -- A simple Open Source Bash Status updater (v0.0.5 Stable). Also obtaining more features and optional GUI.
Twitter Thingy - A very simple Adobe air based Twitter client for windows, OS X and Linux. It has all the essential functions that get you using the best parts of Twitter as quickly as possible, without having to learn a colossal new bit of software. It also does groups and archiving as well as threaded replies.
Twitter from TextMate - A simple little script that allows you to tweet from TextMate with a GUI Dialog popup.
Twittereze SIMBL extension for Twitterific by Sören Kuklau
Twitterlex. Dashboard Widget by Brett Taylor
Twitteromatic. OS X. Send out current weather, iTunes track, secret word of the day, this day in history, uptime and current IP.twitter zone
TwitterPod. A Twitter app
TwitterPost. OS X. Desktop app by Maury McCown
Twitterrific. OS X. Desktop app by Iconfactory (See also Wiki page)
Twitter Studio. OS X Desktop app by BlueCrestStudios
Twittia Twitter-client for OS X by Jeena Paradies
Twoot - An ad-free open source minimalistic customizable twitter client for those who know HTML and CSS. Appified with Fluid.
Twoot - Extended and improved version by Travis Jeffery.
Visionary Saver. A Mac OS X screen saver for Twittervision, Twittervision 3D, Flickrvision, and various others.
Twitterlights MAC app that allows for one click tweeting and content saving (and much more) all free!
Twitminal Terminal app with growl notifications, very lightweight, free kind of cool .
pbtweet - bookmarklet enhancer for twitter.com on Safari, OmniWeb and other WebKit browsers. pbtweet shows conversation chain, media badges and RT/via buttons. Other feature: Automatically update timeline. Automatically adding next page when scrolling down to bottom up to 40 pages stable. Many interaction are animated with using CSS3. pbtweet.user.js for SIMBL GreasKit supports also.-- by t_trace

Linux

BigTweet - BigTweet installs as a bookmarklet and allows you to post to Twitter from any web page. Choose a classic 140 character update, or a 240 character tweet. Insert special Unicode characters and shorten URLs with the Bit.ly API right from the bookmarklet window. Automatically capture the current page title, URL and any highlighted text. No registration is required - only Twitter login credentials are needed.
BLT -- twitter meets the Bourne shell, with a hint of biff.
feedalizr - A free deskptop application that allows you to view, rate and comment on what your friends are sharing online. Tweet, upload pics to Flickr, update your Facebook status, keep up to date with your friends’ Google Reader, Digg, Tumblr, YouTube and Last.fm posts on Friendfeed. Use unique filters to reduce the noise. Duplications are filtered out. -- by MIH SWAT
GtkTwitter -- a Twitter client for Linux and Windows which using GTK.
Gwibber -- an open source microblogging client for GNOME developed with Python and GTK. It supports Twitter, Jaiku, Identi.ca, Facebook, and Digg
gTwitter -- a Twitter client for Linux.
KickTweet -- A very simple KDE Kicker panel applet.
ktwitter - A simple Twitter script for KDE.
mitter -- A very simple Python and pygtk client.
Qwit -- A simple Qt4 based crossplatform client.
Twirssi - Read and Post tweets; Send and Recieve DMs; All from within irssi. Support multiple accounts, context fetching, replying to particular tweets.
Twit and Wayd -- Two addons for Gnome Deskbar that allow posting updates to Twitter
twit.el Another Emacs client.
Twitbar -- a Twitter client for Gnome users to post from the Deskbar
Twittaré -- a light Twitter client written in Qt4
twitter.el Twitter from Emacs!
Twits -- A simple Open Source Bash Status updater (v0.0.5 Stable). Also obtaining more features and optional GUI.
Twitux -- a Twitter client for the Gnome desktop. Features includes: gui-notifications, url tinyzer, and more..
Vim Twitter Twitter from Vim!
ZenTwitter -- bash script which uses zenity and curl (could be launched from custom desktop/menu/panel icons)

Multiplatform

TwitterBEIS - Silverlight 3 OOB (Out of Browser) desktop App, hostted by Microsoft Windows Azure.
Troy's Twitter Script - Greasemonkey Script that adds Nested Replies, @Mentions, Custom Search Tabs, Autocomplete, Pagination, RT button, Media Embed, URL Expansion, Hash Tag Search Links, Social Links
BigTweet - BigTweet installs as a bookmarklet and allows you to post to Twitter from any web page. Choose a classic 140 character update, or a 240 character tweet. Insert special Unicode characters and shorten URLs with the Bit.ly API right from the bookmarklet window. Automatically capture the current page title, URL and any highlighted text. No registration is required - only Twitter login credentials are needed.
Flock - A social Web Browser that has twitter integration built in. Flock also integrates many other social networking services.
Book Price Check - a simple way to check book prices via reply and direct message to your mobile device.
Search Cloudlet - is an easy-to-use Firefox add-on that inserts context-aware tag clouds into a traditional Google, Yahoo and Twitter interface to help you navigate more efficiently through search results.
Twitterfox - TwitterFox is a Firefox extension that notifies you of your friends' tweets on Twitter. This extension adds a tiny icon on the status bar which notifies you when your friends update their tweets. Also it has a small text input field to update your tweets.
AlertThingy - AlertThingy v2 brings the very latest updates from your favourite social networks direct to your desktop. Plus send Tweets, update your Facebook status, upload photos to Flickr, post to Tumblr and more. With v2 AlertThingy makes it faster and easier to manage the online you. Plus you get the coolest looking RSS reader on the interweb.
Friendbar- A Firefox toolbar that is the best way to follow Twitter & Facebook updates, and post to Twitter and Facebook
twAitter (Now in Alpha) - A full Twitter web client with a comprehensive scheduling platform. Schedule tweets to send at anytime(recurring included). Manage your scheduled messages with an Outlook style Twitter Calendar. (www.twAitter.com)
Twitterified - A fast client that also allows users to send/view long messages, pictures, and embedded documents.
Tweetree.com - Web based interface for viewing your twitter stream in a tree with replies nested under the original post they were in reply to. Also pulls in external content from Twitpic, YouTube, etc and displays in right in your feed so you don't have to click through every link to see what it is.
Mibbit.com - A web based IRC, Yahoo and Twitter client.
mytweet16.com - a web app that lets you view any users first 16 tweets. Also has a list of the top 16 searched for users.
gtwit - a web based twitter client which works in all modern browsers without any plugins that supports smart completion, history and personal search of your tweets by storing them on Google's cloud
TwitterGadget - iGoogle gadget and/or browser-based auto-refreshing twitter client with clean web-2.0 style interface and many user configurable options.
Tw-autocomplete - Firefox extension to add autocomplete on Twitter.com for @-messages and d-messages
Autocompletter - lightweight Greasemonkey script to add as-you-type autocomplete for @ usernames on Twitter (demo).
Ear2Ground - Now Ear2Web. An Adobe AIR application that provides live coverage of tweets in your geographic area! Optionally follow tweets on a specific topic in your area.
Yoono - Receive alerts, update your status or message your friends in your browser sidebar. No need to switch from one site to another or from your browser to a desktop app anymore. The perfect tool to become a twitter heavy user without spending hours on it. Yoono also integrates many other services : facebook, flickr, friendfeed, major IM services
Shareaholic for Firefox - easy and quick way to post URLs to Twitter from within your browser. Grand Prize winner of Extend Firefox 2, a Mozilla sponsored contest for the best Firefox addons.
Statuzer a multi-account twitter client with music tweets support (song.ly tra.kz)
TwitKit Integrate Twitter into your Firefox browsing experience.
TwitterBack Sync and befriend all of your followers.
Post to Twitter from Vim for Vim users.
Twitter Opera widget A widget for the Opera browser.
TTYtter An interactive text-mode Twitter client, with full background asynchronous updates, written in Perl 5. Requires curl or Lynx, but no additional Perl modules. Tested on Mac OS X, NetBSD, AIX and other Unix-like OSes. Includes full API and a "bot" daemon mode.
Nitwit, the cross-platform microblogging client for Twitter, Jaiku and other platforms including Jabber and IRC. Written in PHP-GTK.
Tweetr one of the best twitter desktop applications, drag and drop file transfer, send webcam photos instantly, view replies and direct messages, very clean user interface.
twitterAIR -- An AIR (Adobe Integrated Runtime) application built with Flex 3 that lets you view your friends and public timeline, post your status, and determine the auto-refresh interval.
Mugshot for Windows and Linux -- show friends' updates from your favorite services, including Twitter, on your desktop and the web
Spaz -- An attractive, powerful Twitter client for Windows and OS X using the AIR platform. Direct messaging, deleting tweets, user management, and powerful skinning/theming via CSS.
Twitterbot -- A simple bot written in C# (Mono/.NET) to reformat RSS feeds of news/sports/etc for Twitter
videotwit -- Transcoding digital-to-digital conversion from one video format to another
Twerp -- A simple command-line tool to post messages and download your friend's timeline. Python 2.4 or 2.5..
PhotoTwitter. This application allows you to take a Snapshot using your Webcam and post the photo and your text on Twitter. Initially written for Mac but could also work on other platforms. Please let me know about problems on non-Mac platforms.
Twitter4Skype -- Instructions on how to access your Twitter account in Skype. Developer here.
Tweeter -- A Java desktop client for Twitter a-la Twitteroo but with proxy support. Lets you update your status and follow the public/ 'with friends' timelines, view images on the timeline, add/ remove friends, send direct messages, notifications on friends timeline update, minor GUI customization. ( Built with the jTwitter API from ThinkTank )
Twinja AIR -- Twinja! A sleek black Twitter client built in Flash, running on AIR. Allows you to communicate with your Twitter friends directly from your desktop. Works on both Mac & PC.
TwitIt -- A bookmarklet that is perfect for link/microblogging. You activate it while at a web page you want to share. It puts the current page title, a shortened URL (via TinyURL or tr.im) and selected text into the Twitter status box for final editing before submitting - you know - to get down to the 140 limit.
Snitter -- lots of features with a great UI make this Twitter client stand out from the crowd. Built on AIR.
twhirl -- A multi-account Twitter desktop client based on AIR and Flex. Compact UI, keyboard shortcuts, many features like auto-connect, auto-refreshing tweets, sending updates, replies, direct messages and more
twibble -- A twitter desktop client with a clear UI. Supports multi accounts, iTunes like cover flow view and much more. Built on Adobe AIR for Mac and PC.
Posty - A microblogging application which allows updating twitter, jaiku, tumblr, friendfeed and identi.ca profiles with one click. Posty also includes: browsing of personal and public timelines, posting replies, browsing and posting of direct messages, support to favorites, search for past messages, automatic spellchecking, built-in url shortening. Posty is an Adobe Air application which runs on Windows, MacOsx and Linux.
Twitch - A cross platform Twitter client written using Adobe Air. Twitch focusses on having a clean and simple user interface.
IdentiTwitch - A cross platform Twitter client written using Adobe Air. IdentiTwitch combines your updates from Identi.ca and Twitter into a single timeline. Post to one or both services at the same time.
Twitter in your Profile - Plugin for Pidgin that lets you put your Twitter history in your profile. It updates automatically.
Toro for Twitter - Multi-platform Twitter client with a clean interface and an experimental Twitter client library that removed API limits and caching. Refreshes every 20 seconds.
Omnivide -- Twitter Plugin - Omnivide is written in Java, so multi-platform. Only Mac OS X not supported due lack of Java 6. Twitter service provided via Plugin. Omnivide is a plugin powered program still in early stages of development.
Phweet - Phweet lets you talk to Twitter friends and create conference calls without sharing phone numbers or other ID's. Phweet inserts a URL into your Twitter message so your profile becomes your callerID and your status update is the context for why you want to talk.
TweetDeck - TweetDeck is an Adobe AIR app which allows users to split their Twitter feed into topics and/or groups. Works on both Mac & PC. Still in beta.
P3:PeraPeraPrv - P3: PeraPeraPrv is Pure Java multi-platform Twitter client. P3 supports fully keyboard operation, filter view to tracking with @id and keyword, appearance customize, English/Japanese/Chinese interface and many features.
Twitter Thingy - A very simple Adobe air based Twitter client for windows, OS X and Linux. It has all the essential functions that get you using the best parts of Twitter as quickly as possible, without having to learn a colossal new bit of software. It also does groups and archiving as well as threaded replies.
TwitterSpy is a supplemental XMPP bot for twitter that does the stuff the twitter one used to do, and a few things it didn': http://dustin.github.com/twitterspy/
tircd presents twitter as an irc channel. You can connect to tircd with any irc client and twitter as if you were on irc.
TickTagDo - A multi platform Task Management application that supports posting updates to Twitter. You can also automatically create tasks from your tweets. Just include 'NTS:' (case insensitive) in your tweet and TickTagDo will use it as the base for a new task. So now you can add tasks from anywhere you can tweet. Direct messaging is also supported, easily lets you ask for progress on tasks via Twitter.
QTwittering - A very simple Qt4 based Twitter client for Linux, Mac OS X and Windows.
Simple Twitter Client: A simple, compact, open source desktop client written in Scala.
TweetFox - CloudBerry TweetFox is a Twitter plug-in for Firefox that helps you to post quotes from the websites you visit with a click of the button and attach a short Chilp.IT URL to the source page.
Twitter Gadget for Gmail - a Twitter client specially designed for Gmail using Opensocial technology.
Whisltr - A twitter + last.fm mashup in AIR.
TweetBox - A JavaFX based Twitter client
Twitteron - An AIR-based Twitter client that supports search, notifications, a user gallery to view friends/followers in high resolution for any twitter account, display of rate limit/reset time, auto updates, and more. The interface has features similar to a browser, including back, forward, and refresh capability.

Second Life

TwitterBox -- a Twitter client for Second Life.
SLTweets.com -- a Twitter HUD for Second Life, includes mapping, notes, research, SLURL logs. On or off modes.
TinySL.com -- a Second Life specific SLURL builder and long SLURL or Second Life compression too so Twitter users know the content is relevant or an in-world (metaverse) destination.
Squawk -- A Twitter client for Second Life. Also supports Ma.gnolia, del.icio.us and Jaiku. Integrates with Squawknest, a web component with user profiles, tagging and web maps.
Sl-Messenger.com - A global IM/twitter/diary service for Second Life.

Other

Twitter2websms. Send SMS directly from twitter using your websms.lu account.
Twitter Submitter - NO FRILLS HTML by Kenneth Udut. 18 Lines of HTML, Easy to Grasp, Easy to Change. Requires Any Operating System. Requires Any Browser - even Lynx! Win3.1/9x/2k/XP/Vista Mac *nix. FREE and Public Domain. 2 Methods - Safer (manual login to Twitter API) & Unsafer (auto login to Twitter API)
Apollo Twitter Requires Adobe Apollo
VTwitter. Send messages to your Twitter account directly from Zimbra Webmail.
TwitterMoko is a client for Openmoko
DriveBuy. SaaS text messaging app for Real Estate agents allows agents to tweet their property listings.
CrestrTwitr - The first Crestron twitter client. Allows your crestron automation gear to send and recieve Tweets from Twitter.
Toucan - The Twitter Client for Salesforce. Track twitter IDs for your users, leads, and contacts. Search for tweets. Save a watch list to keep track of your contacts' tweets.
Doctor Twitter-is the number one source for FREE custom Twitter layouts, backgrounds, themes and pictures. One Click Theme Apply!
iTweetReply - A service that automatically send you an email every time somebody "@" replies or mentions you on twitter.

Web Applications

Ad Networks

adCause.com: Twitter Ads -Advertise on twitter. Keep the money or donate all or a percentage of your earnings to your favorite charity or cause. Buy and Sell ads on twitter! (follow us @adcause on twitter)
FeaturedUsers.com - If you're a Twitter user, it's a great way to get more followers and support your favorite 3rd party Twitter apps. If you're a Twitter app developer, it's a simple way to start monetizing your application.
Magpie - Convert your tweets into bling-bling by allowing Magpie to post tweets in your timeline or build conversation around your brand by having carefully selected key-influencers spread the word just for you. (click to watch funny video!)
Twitchance.com - Twitchance is a free Twitter lottery. People post a sponsor's message on Twitter to become eligable for a cash price (viral marketing).
Twittad - Twittad helps advertisers build their affinity networks on Twitter by using our technology that hits ALL of Twitter; The Website (www.twitter.com), 3rd party apps (TweetDeck, Twhirl) & Mobile apps like (Tweetie & TwitterBerry)

Analytics

TwitterAnalyzer - is one of the most extensive Twitter applications ever... basically, its a tool for Twitter users to analyze themselves or their friends, but Twitter Analyzer takes the statistics data to a much higher level... (it is called by some Twitter users the "Google Analytics for Twitter users") and rightly so, TwitterAnalyzer features more then 50 statistics measures displayed in 3D graphs and World Maps enabling surgical precision tuning of your twitter stream... you would discover many things about your or your friends Twitter presence... you can even share your statistics with your friends.
ObjectiveMarketer - is one of the first, enterprise grade end-to-end campaign management, analytics and community engagement solution. It has all the basic features of any content authoring and publishing tool like Posting, URL Shortening, tracking, scheduling, multi account management. PLUS it is the only available application that provides Camapign Management across Linkedin, Twitter and Facebook. It has advanced patent pending technology to measure and map the audience sentiment that lets marketers optimize their message. Analytics based on geographic location, and other demographic data, along with ability to set and monitor several keywords and competition matrix and Buzz Factor - ObjectiveMarketer is the one-stop solution for marketers. It brings strategy on social channels.
TweetBuzzer lets you track the brand buzz on Twitter. You can see the top tweeted brands in a 24 hour, 7-day, or 30-day period. You can also track your favorite brand, see the percentage change over time in tweets and impressions, and submit a brand to be tracked.
Klout - Discover how influential you are on Twitter. See who influences your friends and measure the impact of your content.

Badges and Widgets

GeoTweeter Widgets - Display all your GeoTweets in a map widget that updates live from your twitter feed to display where you are, where you've been, and all the photos, notes and ratings you've made along the way.
Twitter Name Tag - create and print a unique twitter nametag for your next meeting or social gathering.
Sprout - Create a rich multimedia widget that pulls in your Twitter feed and photos.
TwitterSALT- Twitter to Image: Monitoring & Conversion Service. Paste one line of HTML into any web document and your twitters will show up in that document from one to three minutes after you twitter. Works on MySpace, Facebook, Craigslist, BBS Forums, email, and, of course, your own blog or webpage.
TweetRoll - Add a badge to your website or blog to show avatars from other tweeter you're following and how many followers/friends you have. Now with personalisation options to let you specify colours, size and tagline. Also available as a Wordpress widge
SayTweet Twitter Badge - Create a Twitter badge using your own picture! Upload a picture, tag users in that picture, and have their tweets appear in speech bubbles. Embed the badge in your blog, website, or MySpace!
Kent Brewster's Twitterati Badge - Interactive Twitter badge; single-line JavaScript include, highly customizable, lets you start with your followers (or mine, or anybody's) and surf around from follower set to follower set.
Netvibes Twitter Widget - Official Netvibes Twitter Widget
Twitter King Widget - UWA for Netvibes and Google by Porno Schorsch
Twitter Web Badges - The official Twitter web badges (available in Flash or Javascript flavors) for showing your recent tweets or friends list on your web site.
Chris' Twitter Badge -- a simple javascript badge that matches Twitter.com's color scheme. Code included.
Jon Aquino's Twitter Badge - a modification of the official Javascript web badge that shows multiple recent tweets and fixes a date parsing issue in IE. Source code included.
Morgan Aldridge's Twitter Badge - another modification of the official Javascript web badge that shows one or more recent tweets, the twitterer's icon, links to tweet permalinks, and has more CSS hooks for better styling. Source code included.
Wishafriend.com Twitter Widgets - Display your latest Tweets (Twitter updates) on your blog, website, myspace profile or anywhere else in a cool flash widget. Themes include flowers, smileys, hearts, etc.
Twitter WordPress Sidebar Widget a WordPress Widget plugin for your blog as an alternative to the badges provided by Twitter.
Twitter Planet -- a Twittervision-like Windows Live gadget.
Twitter Flash Clock - flash clock which can be embed on twitter pages.
WithFriendsHtmlTwitterBadge - an HTML Twitter Badge that shows the "With Friends" feed.
Tweets -- iGoogle gadget (can be used also for OpenSocial containers).Navigation through the social graph of Twitter users, showing their tweets and persons they are following. See also http://gmodules.com/ig/creator?synd=open&url=http://www.openopensocial.com/apps/tweets.xml for web version (430px wide).
TwitterCard -- Create a 125x125 Twitter business card widget to put on your blog and display bio and recent status.
TwitterMySite -- Create custom "follow me" buttons for your blog with any text included in the image!
Sigpad -- put your Twitter status in your email signature.
TweetThis -- Add "TweetThis" button to your blogger.com blog and increase the visibility of your blog post. Let your blog readers to tweet about your post with a simple mouse click.
TwitIMG -- Provides you with an automatically updating image for use on forums and blogs. Just tweet, your image is updated with your latest tweet.
Twitter Buttons - Hundreds of original Twitter buttons and badges - transparent, cute, animated.
allyve Twitter Widget - Official allyve Twitter Widget

Business

adCause.com: Twitter Ads -Advertise on twitter. Keep the money or donate all or a percentage of your earnings to your favorite charity or cause. Buy and Sell ads on twitter! (follow us @adcause on twitter)
@chagroup - A twitter feed that publishes best practices in marketing and pricing
TwtQpon - A simple coupon creator for businesses. Increase sales and engagement with your followers by offering exclusive deals on Twitter. (By @twtapps)
twAitter - A full twitter client with a comprehensive scheduling platform so businesses can schedule their tweets (plus recurring) and manage their tweets in an Outlook style calendar. Finally use Twitter to its full potential for your business!
Business Exchange - BusinessWeek's social media site allows you to simultaneously post your reactions (brief comments) to artcles on both the BX site and in your Twitter stream.
AddressTwo - a CRM system with built-in tracking for twitter activity.
ObjectiveMarketer - is one of the first, enterprise grade end-to-end campaign management, analytics and community engagement solution. It has all the basic features of any content authoring and publishing tool like Posting, URL Shortening, tracking, scheduling, multi account management. PLUS it is the only available application that provides Camapign Management across Linkedin, Twitter and Facebook. It has advanced patent pending technology to measure and map the audience sentiment that lets marketers optimize their message. Analytics based on geographic location, and other demographic data, along with ability to set and monitor several keywords and competition matrix and Buzz Factor - ObjectiveMarketer is the one-stop solution for marketers. It brings strategy on social channels.

Dating

Radaroo- Simple and free Twitter dating application.
Twitcush-Declare a Twitcrush on someone, see who has declared one on you! (Great for getting the attention of Twitterati.) (By @missburrows)

Diet and Exercise

Tweetwhatyoueat Twitter-based food diary. Use Twitter to track what you eat by ‘tweeting’ food items you’ve eaten from your mobile phone, IM or through Twitter.com. 'follow twye' for more info.
FoodFeed Twitter-based food log. Track what you eat by prefixing a message with @having, or direct messaging having. Results will be on username.foodfeed.us. fastmedicalinfo
gtFtr - Get Fitter with Twitter. Tracks exercise stats (eg Elliptical workouts or pushups) and graphs your progress over time.
TweetPlot - Chart/Plot various stats you keep track of via twitter (running milage, calories, reps, weight, etc.)

Entertainment

StoryTellerMe - create never-ending stories and poems, one line at a time with the help of tweets from @storytellerme. Since you can only add one line, and have to wait for someone else to add the next line, you never know the direction the story will take.
chirpchirp.tv - Watch a tv show and chat about it with other twitter users who are watching the same show at the same time.
ConfessToMe - follow @confesstome to get real-time confessions from those who need to divest themselves of their secrets.
qmpeople - A new place to meet new friends around the world. It uses Twitter and Facebook APIs to sync your statuses on the Net.
TwEnglish - Translate words and sentances into 'twitter speak' to amuse your friends and followers on twitter.
Twtcard - Send greeting cards on Twitter. No username/password required. (By @twtapps)
Twtvite - A simple event organizer. Create a tweeup. Invite your tweeple via a short url. Manage RSVPs. Search for tweetups in your city. No username/password required. (By @twtapps)
Tweeght - A place to share thoughtful Tweets and quotes. You can Vote up, Retweet and Reply to the ones you like. In short, it's a Digg for thoughtful tweets that are shared on the twitter. (By @adityakothadiya)
TweetMyEps - A twitter app that will add any tv-series you watch to your twitterpage (by @trackmyeps)
Tweet on the Street - A Twitter-based rumor mill. Search for the latest buzz on technology, celebrities, politics, sports, and more.
Twoilet - Hilarious collection of potty-humor inspired tweets.
Twypos - A collection of Twitter typos. Constantly scanningTwivie the timeline for offenders. (By @iancorbin)
Ykyat - "You know you are addicted to..." A fun place to share classic 'addicted to' jokes. Rate and comment the best ones. (By @chrismdp)
twittypop - Who's the hottest boy or girl on Twitter? A fun way of discovering new people on Twitter, increasing your followers, sending out a crush notification, or checking your own popularity.
Twivie - Your tweets rating movies... With just one tweet you can rank a movie or see the top movies, and ultimately choose a good one.
Twtbox - A jukebox powered by tweets
TweetTheFuture - A search app that allows searching twitter prophecies on topics. (by @duilen)
TWindowPane - Just follow @twindowpane to get your picture on this unique mozaic.
Infinite Monkey Comics - A random comic generator using text from Twitter superimposed over a random image from Flickr, using keywords of your choosing. Tweet your funniest creations to @InfiniteComic

Games

GuessWord - remember Mastermind? Well this game is similar. The GuessWord server hides a word and you try to guess what it is. Tweet any word to @GuessWord and you will get clues to the mystery word within 20 seconds. Be the first to get the points. As a never-ending game, a new round is constantly created after one completes.
FlockPoker - With FlockPoker you can create your own Texas Hold 'Em poker table and invite people through one simple link. It's easy and free, try it.

TWord_Chains - A morphing word game where you change one word into another following rules. Played with tweets so that people know when a chain has been changed. A word chain is like: MILK ... MILE ... LIMES ... SLIMED. This game is co-operative rather than competitive.
Tweet Words - A tweet-based mystery words games. Clues are tweeted to followers about every 5 minutes. Tweet back with your guess. A leaderboard is maintained. Follow @Tweet_Words to get your clues. Once the current word or phrase is complete, a new one starts automatically.
Tweet Quiz - A tweet-based quiz where you must find hidden words and phrases using clues that are periodically tweeted. For example, a challenge might entail "Things associated with a Volcano" or "A meal or food made with Eggs". Tweet your answers with an @reply or play on-line. Slight misspellings are tolerated.
Twetris - A tetris like game that uses the latest tweets from the twittosphere as blocks for the game.
Twtpets - A simple twitter game for pet lovers. Upload a picture of your pet. Share it with your tweeple via a short url. Vote on the cutest pet. Disclaimer: All pets are cute! No username/password required. (By @twtapps)
Which Twitter Celebrity Are You? - A fun quiz. Answer a few questions and we'll tell you which celeb you are most similar to!
Whose Tweet? - A game that tests how well you know your Twitter friends. Can you figure out whose status message this is?
TweetTest - A collection of 6 mini-games that use data from your public Tweets.
Tweetaways - an easy way to pick a random person who has tweetwed a specific phrase. Handy for drawing winners on free giveaways on Twitter.

Groups and Organizations

ConnectTweet - Groups and businesses are made up of many people, not faceless Twitter bots or a single person's voice. ConnectTweet facilitates your voices combining.
Tinker - Tinker is a simple way to discover events people are chattering about on Twitter.
Tweetizen - Discover tweets that matter to you. Create groups based on your interests and filter tweets that you want to read. You no longer will have to scan through thousands of tweets to find something useful. You can find groups on technology, jobs, gossip, news - think Digg.com, but for tweets.
TweetLaw - An application specifically for legal professionals. Legal professionals who join TweetLaw can fill out an extended bio page as well as include themselves in up to 4 legal categories. You can then sort tweets by categories and user.
Tweetworks - With groups and threaded discussions, Tweetworks makes tweeting more useful by tuning out the noise and letting you participate in the conversations that interest you most.

Follow Management

GeoFollow - Geo (location based) twitter user directory. (Add youself on twitter by sending @geofollow YOUR CITY, YOUR STATE YOUR ZIP #tag1 #tag2 #tag3. EG: @geofollow Walnut Creek, CA 94596 #directory #geek #people. Click here to list yourself.
Twitoaster - Threads all your twitter conversations like on a message board / forum. To use it and get your tweets toasted, simply follow @twitoaster.
TwitterMass - A Twitter networking tool on cruise control. This application grows your Twitter network based on a keyword universe that you provide.
Tweepular - The Ultimate Follower Management Tool. Find out whos following you and whos not and quickly cleanse your Twitter account of users that have not updated or are not valuable to you.
TweetTop.com - Who to follow on twitter. The latest and greatest from Twitter people on popular topics. We update the latest thinking from topic experts every 3-5 minutes.
iFollowBack - Fast Twitter Networking: It is a way to identify, get followed and follow back your friends on Twitter. You sign up and agree to follow back other users. Other users sign up, and agree to follow you.

TweepleRank - Ranks the top recommended people on twitter. It does so by monitoring the tags #followfriday, #mrtweet and #tweepletuesday. The site also allows you to search, filter by tag, or even personalize the results to find new and interesting people to follow.
TwitR User Directory where you can track people by tags, and also you can track their followers on a handy graph.
Twidiots - Find out people, who have left twitter, who do mass-flollow, who has a lot of friends(and probably dont read anybody's updates), who follow some persons, unpleasant for you or those, who simple don't follow you back. All this in 2 clicks. Make your friend list and timeline cleanr!
Twibes - Hand picked friend recommendations
FlashTweet - A mass follow tool that simplifies the process of adding your twitter friends. You can see who you are following that is following you back, follow friends from other users and even unfollow multiple friends at once.
tweetListings - Real-time Twitter job listings.
Tweeter Tags - Get the most out of Twitter by finding the right people to share the conversation: Tweeter Tags makes it easy to declare your interests and find new, like-minded friends. Have a question you need answering? Find relevant people on Twitter to ask.
Twitter2FF - Sync your Twitter and FriendFeed contacts! From @twit2apps!
TweetLater.com - Auto-follow new followers and send auto-welcome messages.
Mr. Tweet - By looking through your network and tweets, Mr. Tweet will regularly suggest good people you are missing out on, recommend you to enthusiastic users relevant to you, and regularly update useful stats of your Twitter usage
New Follow Notify - Get to know your new followers better
DoesFollow - doesfollow.com will quickly tell you if one person follows another on Twitter. saves you from paging for the answer.
Friend Or Follow - Friend Or Follow helps you manage your Twitter contacts. Submit your Twitter screen name to find out who you're following that's not following you back, and who's following you that you're not following back.
Twitoria - How many twitter friends are you really following? Twitoria reveals friends that haven't tweeted in a while without having to enter login information.
Qwitter - catch twitter quitters
Twalala - twalala gives you the ability to mute the people you follow and mute tweets that contain specific keywords.
MyCleenr - MyCleenr is a unique way to sort your friends by their last tweets. It allows you to get rid of all the inactive and useless accounts that you are following!
Twitter Karma - Pulls your Twitter contact information and presents a simple interface for following, unfollowing or blocking people, with several useful sorting options.
Twitterless - Twitterless will notify you when somebody stops following you and tell you who it is and your follower history is graphed out over time.
Twitblocker - temporarily hide excessively chattery friends without having to surrender your password to a 3rd party, with this greasemonkey script.
Retweetrank - Ranks each user depending on number of times they have been retweeted. Also, presents a list of top 50 twitter users who have been most retweeted recently.
UnTweeps - Lists Tweeps you are following who have not updated in 30, 60, or 90 days. Unfollow them with one click. Now using Oauth! Keeps your password secure.
Tweet-Rank - Check the quality of your Tweets. Just enter username and tweet-rank will show you with which tweet you won or lost followers.
TweepDiff - Compares the friends or followers of any two Twitter users to see where they differ and overlap.
Follow Cost - Provides stats on how frequently a Twitterer makes updates. Includes stats on @ frequency and political tweet frequency.
WhoFollowsWhom - helps quickly find common followers of several Twitter users as well as who they are following in common.
FavTwits - See who you talk to most, and who talks to you, using @username.
twitTangle - untangle the mess of having too many friends on twitter. We allow you to rate and tag your friends and then filter your timeline to help you easily find the tweets that are most important to you!
TwtrFrnd - Find out who two Twitterers follow in common, plus who Twitterer 1 is following that also follows Twitterer 2.
TweetSum - Follow or ignore your recent followers with a simple drag and drop interface.
Topify: Smarter Twitter email follower notifications. Know exactly who is the personn following you. 1 click follow back, by just replying to the email. Answer to Direct messages directly from your inbox
Mutuality: Tool for mass unfollow unmutual followings.

Twittermap displays all your followers on a Google Map
T witSeeker Find & follow tweeps based on keywords you choose.
Mr. MileStone - Notifies you when you have reached 100 followers. Repeats every 100th.
FollowFriday! - Helps generate follow friday list.
Tweepler - A Twitter management tool that was featured on Tech Crunch and has raving fans.
IsFollow - A quick and easy way to find out if someone is following you or someone you know, without having to login. Also find what celebrities are following other celebrities or if all your business related twitter pages are connected.
ObjectiveMarketer - is one of the first, enterprise grade end-to-end campaign management, analytics and community engagement solution. ObjectiveMarketer gives you real time information on follower and unfollower stats. With ObjectiveMarketer, users can be followed based on sentiment mapping and topics of interest monitoring. This leads to acquiring right audience and better communication.
NutshellMail - A free service that brings full Twitter functionality to your email inbox. NutshellMail tracks all new followers, quitters, direct messages, @replies, and the latest tweets from people you follow. You can also update your status, send dm's, retweet messages, reply, follow and unfollow users through email. NutshellMail delivers a summary email digest of all your Twitter activity on a recurring schedule that you choose. It can also track your Facebook, MySpace, LinkedIn activity and new messages from your alternative email accounts.

File Sharing and Storage

FileSocial - Tweet your files! All you have to do is sign in with twitter, write some text, and attach the document you want to share.
TweetCube - Allows sharing of files via Twitter, from MP3s to PDF, Images to Excel files. Just log in and Tweet.

Gallery

Twapps.com - A twitter gallery that show cases all twitter applications. Growing daily.
Twitter News - Latest news about twitter at one place
Twi5 - A one stop shop for finding cool twitter applications.
Twtapps - We develop simple, fun and useful twitter apps. Our apps don't require username/password!
A monster list of all web based twitter applications: http://i-stuff.blogspot.com/search/label/Twitter

Local

GeoFollow - Geo (location based) twitter user directory. (Add youself on twitter by sending @geofollow YOUR CITY, YOUR STATE YOUR ZIP #tag1 #tag2 #tag3. EG: @geofollow Walnut Creek, CA 94596 #directory #geek #people
StreetMavens - Real time social media and information by City and category. Post photos to Twitter, easy to Reply and RT, view recent @replies. Also features local maps and radio. Full mobile site (including photo uploads) and API available.
ChirpCity is Twitter by city. Local search, latest tweets about and from your city and a top users list.
Windy Citizen Twitter Tracker is a Twitter buzz tracker for Illinois' special election to replace Rahm Emmanuel in the United States' Congress. Graphs their Twitter mentions over the last two weeks, pulls quotes from linked articles and lets you sift through messages mentioning all of them. It's the first local, political Twitter mashup.

Marketplace

iList Micro - A micro-classifieds service built on top of Twitter. It’s an easy way for you to tell people you have something, or you want something. Participating in iList Micro is as easy as adding an #iwant or #ihave to the end of you status update. This gives everyone an open, real-time marketplace to search through at any time.

Media - Photos and Videos in Tweets

StreetMavens - Post photos to Twitter. Full mobile site (including photo uploads). Real time social media and information by City and category. Easy to Reply and RT, view recent @replies. Also features local maps and radio. API available.
TwitPic - Share photos on twitter.
Twitgoo - Share photos and videos on Twitter.
TinyPic - Upload, edit, and share images and videos to Twitter.

Multi-account Management

ObjectiveMarketer - is one of the first, enterprise grade end-to-end campaign management, analytics and community engagement solution. It has all the basic features of any content authoring and publishing tool like Posting, URL Shortening, tracking, scheduling, multi account management. PLUS it is the only available application that provides Camapign Management across Linkedin, Twitter and Facebook. It has advanced patent pending technology to measure and map the audience sentiment that lets marketers optimize their message. Analytics based on geographic location, and other demographic data, along with ability to set and monitor several keywords and competition matrix and Buzz Factor - ObjectiveMarketer is the one-stop solution for marketers. It brings strategy on social channels.
Splitweet - Free Twitter multi-account manager & brand monitor. With Splitweet webapp you can send tweets from all your configured Twitter accounts (with password encryption), view your friends' tweets, your direct messages, your favourites... and the most important thing: you can listen & get involved into the conversation with brand/keyword monitoring.
TwitIQ.com - Full featured Twitter web client with support for multiple account, keyword and topic insight, integrated Twitter, Blog, and News Search, rich User Profiles, inline Reply display, URL shortening support, and many other UI enhancements.
Twitomate - Too much too say? This is a simple app to import and queue tweets across multiple accounts for automated tweeting.

News

Flackr - A realtime news tracker that uses Twitter news sources, twitpic images and people commenting on the news.

Nightlife

MeetNowLive - Real-time mobile social network for nightlife that lets you tweet your nightlife activity. Use MNL Mobile to "Broadcast" your location from bars & clubs and your activity will be tweeted automatically. Email info@meetnowlive.com for access to private beta and link your twitter account to your MNL account under Account Settings.

Personal Finance

Tweetwhatyouspend Cash tracking made simple through Twitter - answers the question, "where does my money go between trips to the ATM?" Follow 'twys' on Twitter to get started.
Xpenser - Track time and expenses via Twitter (or email, SMS, IM, call and say your expenses, use the FireFox Plugin, etc). Tag, search, import, export, track mileage, convert currencies, etc.

Printing

Printyourtwitter New! Print your tweets and keep them forever, create a diary of your life, add your tweets to your holiday photos, print what you twittered last month or last year.

Posting and Alerts

Twittsms New! Update your twitter sending SMS to a phone number of Spain with the same cost of a regular SMS. Recommended for Spanish people (Spain).
Followize - A powerful, streamlined interface for Twitter. Read tweets organised by person. Load timelines and tweets people are replying to. Post, reply and retweet in a snap.

Prune.it - Get a looong url pruned to 20 chars, or get a pruned url for an uploaded image, add a comment and send to your Twitter profile - all under one roof !
Tweet Counter - Get alerted when you reach an important number of status updates (100,500,1000, 1500)
myconcertarchive - Manage your concerts history list (future and past events) and automatically publish to twitter
TweetCall - Update Twitter by voice by dialing 1-877-TWEET-CALL. Tweets are transcribed into text. @TweetCall
reTweet.it - retweet other members tweets and get retweeted yourself.
Listento.fm - Share music & video on Twitter. You can either search or post a direct MP3/Youtube/IMEEM link. Our tool will generate a media page (with your page design) for you to share with your twitter fans. @listentofm
BigTweet - BigTweet installs as a bookmarklet and allows you to post to Twitter from any web page. Choose a classic 140 character update, or a 240 character tweet. Insert special Unicode characters and shorten URLs with the Bit.ly API right from the bookmarklet window. Automatically capture the current page title, URL and any highlighted text. No registration is required - only Twitter login credentials are needed.
Book Price Check - a simple way to check book prices via reply and direct message to your mobile device.
XLTweet.com - For eXtra Long Tweets (tweets over 140 characters) Super easy-to-use. Includes rich text editor for formatting fonts (styles, sizes, colors) and bullet lists (similar to this PBWiki editor).
twAnswers.net - ask any question and you will receive an automatic answer via twitter. other twitter users can also answer your question
Twerbose - Quickly post larger tweets to twitter. Up to 1,400 characters. Then followers can comment on your massive tweets.
twittinesis.com - Copy tweets from your twitter page to your blog. Supports more blogs than other services that perform this service.
Twoxit.Com - Embed a twitter form into your website for your visitors to update their twitter profile for free. Choose from many template styles & sizes.
plzRT.me - adds a compact retweet link to your tweets, enabling and encouraging users to retweet you with a click and comment. Retweets/comments are displayed in a thread.
a2f.me - create a short URL, update your twitter status with personalized message, requires username/password. You may also send a text message to a mobile phone, as well as update facebook (Alpha Release)
twAitter (Now in Alpha) - A full Twitter web client with a comprehensive scheduling platform. Schedule tweets to send at anytime(recurring included). Manage your scheduled messages with an Outlook style Twitter Calendar. (www.twAitter.com)
twt.fm - tweet some music! type in an artist, track, and your twitter username. twt.fm will then generate a track page for you using your twitter page design and you'll be able to tweet it to your followers. @twtfm
Twickly.Com - Make quick tweets to your twitter profile using predefined common message templates then allows you to post stright to Twitter FREE! Helping you save time & effort.
twe2.com - Twe2 sends your Twitter alerts via SMS technology directly to your mobile device - Free. It works in Europe, Canada, Australia, US and others.
Twitter2Mail - Send your @replies via email (or possibly even SMS). Get your emails in nicely formatted batches or for every @reply! From @twit2apps!
TweetLater.com - Schedule future-date tweets for as many Twitter accounts as you want.
Annotated links - pack a bunch of links as well as your post-it note into one shrot URL and share it via Twitter
mail2.im - mail2.im relays messages. Get your inbound twitter notifications routed to whichever IM or phone you're currently using. Get other messages to you routed to you as twitter direct messages. Twitter specific instructions on getting started here
Protected notes - publish password protected tweets, share password protected files via Twitter
Secure notes - publish one time readable tweets. Secure notes in the public status line.
Twash - Twash is a database that cointains awesome tweets. You can add a twash, or vote twashes to improve their ranking. Discover some cool tweets in twash!
Twonvert.Com - The new way to say more with your twitter update. No need to struggle to squeeze words into your twitter posts - twonvet converts / translates your tweets into shorthand language, slang, text message speak & common abbreviations then allows you to post stright to Twitter FREE! Helping you say more with less characters.
Tweetube - Easily share your favorite YouTube videos on Twitter. Allows discovery, tracking and comments among your followers.
2tweet - 2tweet is a free service from 2pad to easily tweet photos and videos from email, just email your photos/videos to twitter@2pad.com - the first time you'll receive an email with instructions to activate your account, then everything will be automatic.
PingVine - PingVine is a free service that takes an Atom or RSS feed from your blog, lifestream or favorite website and posts it to Twitter, Ping.fm, or Identica.
Posterous.com -- Posterous lets you post multiple photos, video, music, all through email. Autopost to twitter via email. Best Mobile Startup Finalist, Crunchies 2008
Song.ly - Song.ly lets you share music on twitter.
Acamin.com - http://www.acamin.com - A convenient and ethical way of sharing/posting files on Twitter
Tweetworks - With groups and threaded discussions, Tweetworks makes tweeting more useful by tuning out the noise and letting you participate in the conversations that interest you most.
Tweetparty - Tweetparty lets you create and mange contact groups and send direct messages to them.
Tweet13 - Tweet13 lets you publish ROT3 obscured updates and add an optional decipher link.
Postica - Postica lets you create sticky note reminders via twitter.
Twitter Weather - Twitter Weather lets you publish daily weather updates to the twitter user of your choice!
Twittertise - Twittertise allows you to schedule in advance and track the clickthroughs on tweets. Ideal for advertisers looking to measure effectiveness.
twiggit - twiggit is an automated service that lets your friends on twitter know what articles you digg.
Mobypicture - Mobypicture lets you share postings to your Twitter, Flickr, Wordpress, Blogspot, Tumblr, Hyves and Jaiku accounts from your mobile phone, email or from the web, including pictures, text and soon video and audio!
Tweetly Updater - a Wordpress plugin that updates Twitter when you create or edit a blog entry, it uses the bit.ly service for short urls.
Joint Contact - Integrates online project management and Twitter. Allows users to send project related messages directly to Twitter. See printscreens at our blog or contact us.
theTwitterTagProject - Because Facebook shouldn't be the only app with SUPER-POKE!
TrackThis - Track your FedEx, UPS, USPS and DHL packages using Twitter direct messages
SalesTwit - Contact management for Twitter. Load your electronic (gmail, yahoo!, outlook, mail) address book and get regular twits reminding you to contact folks. d msg back and leave notes about your contacts. {beta: use sign-up link at top and invite code: sttest}
Twitzer - Twitzer is a tool which lets you post text longer than 140 characters on Twitter. It can be used from within Twitter and no sign-ups or sign-ins required.
fitURL - fitURL creates short URLs just like tinyURL accept it fights spam by checking for spam URLs which makes it much more reliable!
twi8r - twi8r translates text message shorthand to English and vice versa and let's you post immediately to twitter. No sign-ups/sign-ins required. Works on mobile browsers also. {beta site – new features added every week}
TwitPic - Share photos on twitter.
TwitOrg - Twitter for organizations. Create / Manage / Join organizations with TwitOrg.
TwitPlan - Plan tweets.
LinkBunch - Put several URLs into one bunch, which is a compact URL that you can use in your tweet. Kinda like TinyURL, but for multiple links.
QuoteURL - Build quotes from Twitter, create sets of individual updates and have them all in a single page that can be shared with your friends or embedded in your website. (video demo)
MessageDance - sign-up now - Send photos, videos, any file type from your email, YouTube, iPhone and Facebook to Twitter. You can create a blog post the same way with a tweet to Twitter as well. How Twitter integration works.
Tweet Scan - Get tweets emailed to you that match your keywords and phrases on a daily or weekly basis.
Twittermail.com - Send and recieve tweets via e-mail and has some other great features like tweeting in the future, and recieve replies updates in your mailbox!
MobiFeedLive.com Receive Keyword Based Email Alerts so you can see who is saying what about you... Also has Search, Link Metrics, and Trend Analysis...
EmailTwitter -- free Mail-to-Twitter gateway, lets users post Twitter updates and retrieve Twitter timelines via a cellular phone or other e-mail enabled mobile device without incurring SMS fees.
Tweetahead Dashboard Widget - allows you to schedule tweets into the future (homepage)
John Doe - the anonymous twitter user :)
LoudTwitter - Daily email you tweets at your email address. This is the exact contrary of Twittermail.
RetweetMe - Get reminder tweets with an easy to use natural language for specifying the time of the reminder @retweetme in 15 minutes; update your twitter status. Follow RetweetMe
SnapTweet - Posts your latest Flickr photos to Twitter! Very simple.
ProjectLocker - Sends Twitter direct message updates when a change happens in your Subversion repository.
tweetshots - tweetshots enables you to take a twitter tweet to tumblr or embed in other pages/blogs. tweetshots are tweet screenshots, automated.
Twitter Answers with @TweetAnswers - Ask questions and get answers with Tweet Answers! It's like Yahoo! Answers, but for Twitter. Simple to use: "@tweetanswers #topic Your question". Follow @tweetanswers for new questions, or go to TweetAnswers.com. By @mdjensen
LiveTwitting - Use LiveTwitting for your next conference, event, or meeting instead of liveblogging. Simple commands to turn recording on and off, all through Twitter! Learn how to use livetwitting or check out LiveTwitting events. By @mdjensen
BiggerTwitter - A service similar to Twitzer which allows you to post longer messages, although works by placing a link in the Tweet.
PicPostr - A service designed to let you send photos from your phone to your twitter or identi.ca account. Email photos from your phone to PicPostr and have a shortened URL and description posted directly to your account.
Voolia Murls - A unique URL shortening service that converts several URLS into a single, short url with preview and other handy features.
SecretTweet - Post your secrets and private thoughts anonymously to Twitter. It's like PostSecret for Twitter.
HappyTwitday - Celebrating all Twitter Birthdays! Checks all Twitter messages for Happy Birthday messages, and assigns the birthday to the @Twitterer. Multiple birthday wishes are tallied as well. Follow @HappyTwitday to get notified when one of your Twitter friends has a birthday through @reply messages! By @mdjensen
Tweetmarks.com - Twitter Bookmarks - Automatically save and categorize the links you tweet about, and automically add them to your del.icio.us account! By @mdjensen
Dadnab - Plans your trips on public transportation using text messaging (SMS). Optionally notify your Twitter followers of where you're planning to go.
Unicode Symbol Map - Bookmarklet for quick access to unicode symbols '64.
gamerDNA - Automatically share your video gaming by connecting your gamerDNA.com account to Twitter. By @gamerDNA
Twilert - Twilert is a Twitter application that lets you receive regular email updates of tweets containing your brand, product, service, well any keyword you like really.
Twishlistter - Create a wishlist by sending messages to a Twitter user.
Twitter Toolbar - Toolbar for the Firefox browser. Quickly post updates, and check for replies.
Mr. MileStone - Notifies you when you have reached 100 followers. Repeats every 100th.
Twrivia - Tweets a daily trivia question.
theSUGGESTR - theSUGGESTR.com allows you to post your ratings of local restaurants and businesses directly to your Twitter account.
Plinky - Plinky makes it easy for you to create inspired content. Every day we provide a prompt (i.e. a question or challenge) and you answer. Easily shares your answers on Twitter. Follow @plinkyprompts to receive the daily prompt.
VacaTweet - Let your followers know when you are out of town, or just send an @reply to them when they message you.
TweetMyJOBS - Job Posting and searching service for Twitter.
TwitPickr - Are you looking for an easy way to upload your twitpick images to flickr? Stop looking, twitpickr is all you need
RSSFriends - Creates a RSS Feed of your new followers or unfollowers.
Twittley - First Twitter Social bookmarking site.Submit cool news you find,and share it with other Twitter users
Impersonitter - allows you to update your Twitter status while letting you specify a "source." (e.g. having "from TwitterBerry" at the bottom of your tweets-- even if you don't have a BlackBerry or the TwitterBerry app.)

Productivity

Tweepular - The Ultimate Follower Management Tool. Find out whos following you and whos not and quickly cleanse your Twitter account of users that have not updated or are not valuable to you.
TweetMyLink.com - Post your link for the whole Twitter world to see. Vote or ReTweet your link to the front page for maximum exposure. No registration required.
Tweetans -Ask a question (any question!), and receive answers from experts all over the world!
21Tweets - Create a new habit and change your life. 21 tweets in 21 days and you are used to another habit. Works a little like a personal coach for you to support you in your change. With calendar statistics
BigTweet - BigTweet installs as a bookmarklet and allows you to post to Twitter from any web page. Choose a classic 140 character update, or a 240 character tweet. Insert special Unicode characters and shorten URLs with the Bit.ly API right from the bookmarklet window. Automatically capture the current page title, URL and any highlighted text. No registration is required - only Twitter login credentials are needed.
DreamTweet - Anonymously post your dream or nightmare for the world to see! A live Twitter integrated dream log.
HootSuite.com - Manage multiple Twitter profiles, add multiple editors, pre-schedule tweets, and measure your success with "click-through" stats.
MoochFly - Keep track of things you lend to your friends. Sends direct twitter message reminders to help people remember to return the things they have borrowed.
Philtro - Rate articles and tweets so you can find the most interesting, relevant posts first. It's like a spam filter for your RSS & Twitter subscriptions.
twAitter (Now in Alpha) - A full Twitter web client with a comprehensive scheduling platform. Schedule tweets to send at anytime (recurring included). Manage your scheduled messages with an Outlook style Twitter Calendar. (www.twAitter.com)
Readmytweets.com - Read other people's tweets and others will read yours.
TweetLater.com - Schedule tweets, auto-follow and auto-welcome messages, and email keyword alerts.
TweetOClock.com - Find out the best day and time to send anyone on Twitter an @reply or direct message.
TwiST -- Twitter Search Tool, time saving tool for searching Twitter
Twit2Do - Use twitter to manage a to-do list. Update via Twit2do.com or by sending an @twit2do reply on twitter.
Twitter Pigeon - Twitter Pigeon is a new way to ask questions using Twitter. Keep all of the answers to your questions on one page with a unique URL that you can share.
TwitterJobcast - Browse by city to see who is hiring on Twitter or search using your city and state or zip code. Includes cities in the U.S., Canada, Australia, and the U.K.
Twitrans.com - Translate Your Tweets to Any Language by Human Translators. @twitrans help for more info
Tweetreplies.com - Have your @replies send directly to your email in real time, the emails are sent out every 10 minutes.
Twtpoll - A simple survey/poll twitter app. Create polls. Share it with your tweeple via a short url. No username/passord required. (By @twtapps)
Tweetvisor.com - Twitter interface with automatic refresh for real-time updates about favorite topics, news and tweets. Currently supporting groups and friend tags that filter friends timeline, replies and DM sidebars, hot topic box to monitor favorite topics, inline video replies, manage multiple accounts.
TwitExplorer.com - A full featured Twitter web client which allows you to better manage your followers and find new interesting people to follow.
TwitWall.com - The Instant Blogging Companion for Twitter. Blog with video, audio, widgets, and long text; automatically posts Twitter status updates.
Twttrstrm.com - Ask a question, and have other tweeters contribute answers to your Squidoo lens.
Twtask.com - create very simple task lists by @reply or DM @twtask
TweetActive.com - Get real time twitter stream, follow trending topics.
TrackDailyGoals.com - Keep track of your personal productivity by using the #dailygoals hashtag combined with this site.
Tweetizen - Discover tweets that matter to you. Create groups based on your interests and filter tweets that you want to read. You no longer will have to scan through thousands of tweets to find something useful. You can find groups on technology, jobs, gossip, news - think Digg.com, but for tweets.
Twups - Twitter news aggregator, allows you to follow all your favorite subjects in one place. You can even suggest topics!dat
TwitterContd - Allows you to type more than 140 characters and display the entire status on your twitter page. No external links or anything. Also has a feature that allows you to create Shortcuts (for commonly used pharses) so you dont need to type them again and again and also save time ...
Loop12.com lets you encrypt and store any short text and retrieve it later with a few keystrokes. You can send short notes to Twitter and import them directly into your Loop12 account.

Search Engines

GeoFollow - Geo (location based) twitter user search. (Add youself to the directory by sending @geofollow YOUR CITY, YOUR STATE YOUR ZIP #tag1 #tag2 #tag3. EG: @geofollow Walnut Creek, CA 94596 #directory #geek #people
Twifish - Extends twitter search and also searches for synonym words and phrases in twitter.
Twimme NEW – Find out what giveaways, contests, coupons, discounts, freebies and more are being tweeted right now by twitter users.
Tweeple Pages – A user powered directory of Twitter users organized by their interests.
MicroPlaza – Tribal Search, search the hot links shared on twitter and discover the trending topics.
tweetzi - Twitter Search & Trends - A search service for finding and teasing out useful info from the 'Twittersphere'.
allyve.com - Only available in German. Create your personalized startpage and combine it with lots of other personalized widgets like myspace, facebook and other stuff from across the web to your page.
FAROO - A Peer-to-peer Web Search Engine, that integrates Twitter search to discover discussions and people related to the query.
FreeSearch - Find your friends on the web. Simply "follow" freesearch, tweet "@freesearch pete cashmore" or any other name, then wait a minute for the results!
Green Tweets - Tracks tweets about green & environmental topics based on semantic natural language analysis rather than keyword
Navgle.com - Mashup of Twitter Search with Google Search Services to display search results as Universal Search results clustered by source type (Twitter, Web, News, Blog, Q&A, Encyclopedia, etc.)
OneRiot Twitter Search - OneRiot's Twitter search results, for any query, reveal the relevant web pages that are currently being discussed within the Twitter community.
TweetJobSearch - Search jobs posted on Twitter
TweetFind.com - Twitter Directory to Find Twitter Accounts and Add Your Twitter for FREE.
Tweet on the Street - A Twitter-based rumor mill. Search for the latest buzz on technology, celebrities, politics, sports, and more.

Tweet Scan - Search public Twitter posts in real-time from the page or using Firefox's search box. Find replies, track keywords, and sign up for daily/weekly email alerts.
Searching for Interesting Topics on Twitter - Search for comments and users that interst you. Great for finding people to connect with your personal interest.
Terraminds micro search - Search entire public timeline in realtime, fast & responsive! New: Twitter search API
Twellow.com: A People Directory - A directory of Twitter users categorized into hundreds of fields of interest. Allows user to login and categorize themselves.
TwiST -- Twitter Search Tool, an easy-to-use interface to Twitter Search
TwitterTroll.com - Real-time Twitter search engine. Search through 1000s of indexed tweets everyday and find new friends.
Twitterment beta Combines Twitter apps with a search engine and graphing tools
TwitterJobSearch - The first semantic search engine for twitter. Finds all the jobs posted on twitter.
TwitterSearch -- Full text searching for the recent Twitter zeitgeist, complete with toy dude-heads. A must! Also maps posts via Twittermap!
Top News Trends - Top News Trends combines google trends data with twitter search.
Twitter.FM -- Simple but multilingual full text search engine for Twitter, supports CJK, Arabec, etc. Country specified search is also provided in US.Twitter.FM, CA.Twitter.FM, UK,CN,JP,ES,TW,...more!
Twitterverse - a search and visualization project which mines and archives the public timeline of Twitter and provides a visualization of the most commonly used words in a given time period. Search Twitter by keyword.
TwitDir - A Twitter directory, no more. You are looking for someone, something? Just type a few words in the search engine. Enjoy!
MobiFeedLive.com Receive Keyword Based Email Alerts so you can see who is saying what about you... Also has Search, Link Metrics, and Trend Analysis...
Summize Twitter Search - Realtime twitter search with language restriction and threading built right in. Free API included.
Twitigg - See tweeted links Digg style.
Twubble -- Recommends new people to follow based upon your existing follows
WhoShouldiFollow? -- Recommends interesting people to follow based on your network, and supports searching for a location and adjusting for popularity.
picobuzz - Shows popular buzz words from the public timeline and who's sayin' them!
Intwition - Tracks what people are linking to and discussing on Twitter. Let's you lookup and find tweets about any site. Provides an RSS feed to track tweets about any site as well.
Twitter Blacklist - Collects IDs of Twitter "spammer" accounts, those that follow thousands of users at random, in hopes they'll reciprocate and open themselves up to direct-message access. Site offers an API, a Javascript bookmarklet for quick checking wither a given Twitter ID is a flagged spammer, and links to related resources such as a Greasemonkey script (for Firefox+Greasemonkey) that also auto-checks users against the blacklist.
twitter search -Twitter Search engine find through 1000s of indexed pages kuber twitter
FuelFrog - Use Twitter to keep a log of your fuel and mileage. Compare your mileage with others in your area, or with the same car.
TwitFuel - Submit and share local gas prices in your city. Find up-to-date prices submitted by your fellow tweeples and never pay too much for gas again!
TweetBeep.com - Twitter Email Alerts - Like Google alerts, but for Twitter! Save keyword searches and link/domain searches and be alerted by email when someone on Twitter mentions it! Free service, by @mdjensen
Tweetag - Browse the twittosphere with nested tagclouds and never miss any raising trend related to your favorite topics
FutureTweets - a free service that lets you schedule your Twitter messages. Send it at a specific time in the future or send a reoccuring Tweet daily, weekly, monthly or yearly! Handy if you're in need of an alibi.
Twitturls Popular Twitter Links Tweeted err Twittered err Twhatever - Links / Pictures / Video - What's hot on Twitter
TwiSpot.com – TwiSpot is a Topic-Based Social Exploration Tool based on Twitter. Stay updated and explore interesting new topics with the Hottest Tweets all in one spot.
Twithelp.me - Help people in the Twitter community find answers to things they want to know about. Search Twithelp.me for topics, then reply direct to anyone who you can help. You can set up RSS feeds too to be alerted of future Twithelps. If you want help, just include #twithelp in a tweet. (...think of it as Yahoo Answers for Twitter.)
PopularTweets.com - Browse the current top 10 most popular tweets, re-tweets, friends and followers on Twitter right now.
TweepSearch - Search Twitter bios, currently over 1 million indexed. Also provides the ability to search the bios of only those people following you.
TweeterLookup – The easiest way to lookup mutiple Twitter usernames at once from a list of email addresses, without having to input the list into your webmail accounts.
Android software tweets - Watch realtime tweets about Google Android phone(with database with older tweets)
BackTweets - Search for links on Twitter (even if they've been shortened)
TwitterPray - A real time snapshot of what people are praying about on Twitter and what people are requesting for prayer. Trending, history, and request tracking (among other features) are slated to be added in the coming weeks.
Tweeple of India - A searchable directory of twitter users from India
tweetactive - Search tweets & get real time stream.
TweetRSVP - Tweets that include a question or request for information are pulled and available on TweetRSVP in real-time, or through a searchable database or via email. Visitors can reply or RSVP to a tweet directly from the site through twitter.com or by copy and paste if using a desktop client.

Shopping

Book Price Check - a simple way to check book prices via reply and direct message to your mobile device.
RedTagTweets.com - a clean and easy to use directory for coupons, deals, and discounts on twitter. Search or browse through a list of stores.
Twtwlst - A simple gift registry. Enter the occasion, products and links. Share it with your tweeple via a short url. No username/password required. (By @twtapps)
CheapTweet combines digg-style user ratings with Twitter conversation analysis to find the best retail deals people are tweeting about. The more a deal gets re-tweeted and spread around Twitter, the higher it goes in the rankings. Spammy behaviors like duplicate tweets are penalized.
TwitShop - TwitShop uses the real-time power of Twitter to help you find personal sale, trade, and auction items.
HowMuchIs - a quick and easy price check tool. Tweet it the name of an item, and it'll tweet you back the three lowest prices, with ratings and direct links to merchants. Covers millions of products including TVs, cameras, and other consumer goods.

Travel

ArrivedOK - personal flight arrival tracker. Automatically alert others about your arrival via Twitter, blogs, by SMS or email - right in the moment you turn on your cell phone after landing. ArrivedOK tracks your phone when it registers in a local mobile network - and immediately tweets 'Arrived OK' message or sends it by email or SMS to the list of your recipients.
Tweetmapper - Give your tweets location by using the hashtag #at followed be a location (place, street, zipcode, country) as the last thing in your tweet. Get an embeddable widget to display on your blog or website.
TwtTRIP - A simple travel organizer. Add your travel plans. We find other tweeple traveling to the same destination. We find local tweetups (via @twtvite). We display your tweets during your trip. Embed widget on your blog/website. No username/password required. (By @twtapps)
Sat2Twitter - Send your position coordinates to your Twitter followers using a SPOT Messenger or other supported satellite device.
Bird.im - Sharing your bird sightings and birdwatching experience with the crowd via twitter. Bird species, date and location by @adaptive. (status @birdim)
TrainText.com - On-demand BART train times and information by direct messaging your request to @traintext
Twanslink - A Twitter travel service for people living in Northern Ireland. Tweet that a bus is late or a train is running behind to let others know. @twanslink

Trends

Twindz - Discover the most discussed topics on Twitter for any 24 hours period.
Twist - See trend graphs for twitter topics and spot new hot topics. Graphs for last week and last 30 days.
retweetradar - Finding trends in the mountains of information 'retweet'ed on Twitter.
Tweetag - Display the 40 most talked topics in the last 24h in general, or the most discussed topics related to a given topic.
Twuoted - A site that shows all tweets with the #quote hashtag. Great for finding new & interesting quotes. Follow @twuoter for updates & new features.
happn.in - Localized trends.

Twitter Status

Twitter Delay - Monitor how long it takes twitter to deliver messages during periods of high user demand. Watch as twitter battles with the challenges of more and more users on it's service.

Visual

wpTweety - A Twitterwall for WordPress Tweets. Please use #wordpress as Twitter Hashtag.
Cloud.li - A cloud-based Twitter search engine that provides you with a list of commonly used keywords and phrases for another phrase, in cloud form.
Tweet Cloud - This Tweet Cloud shows you the major words found in the most recent tweets of all users or those of a specific user. This changes by the minute! Experiment with the composition of tweets to reveal interesting trends, connections, attitudes, relationships. For example searching on lunch often shows what people are planning to eat.
Twonvo.Com - View your Tiwtter Conversations as a thread - making it easy to follow a conversation and not have to search for each @reply individually.
CrowdedInk.com - Creates a mug with the profile pics of the people you follow on it.
Twitsig.com - Display your current twitter status as an image on forums, blogs, and other web services..
Tweetsig.com - Creates a dynamic image from your most recent tweets for use in signatures on forums, in emails, as well as direct linking
TwitterSplitter - Every time you post a link on Twitter, TwitterSplitter shows a number of other items in a menu across the top, including links to your own blog or website, your Twitter Grade, your name, etc.
Tweetag - Browse the twittosphere with nested tagclouds. You can visualize what are the most talked topics related to your search.
Emoji-fu - Display your Twitter status feed with full Apple iPhone's emoji support. Add the Emoji-fu Browser Button for on-demand emoji translation. No more boxy 2-byte characters!
Twitree - Your followers in a Tree! Expand the tree as much as you want!
Twittergallery.com - Twitter themes with automatic install. Choose a theme, enter username and password and VOILA !
fav.tweets - get a list of all the tweets your friends starred (favorites), or you can simply get a list of favorites for a list of users you specify.
Portwiture - Finds and displays Flickr photos based on common words in your most recent tweets, resulting in a fun and serendipitous visual representation of your Twitter status.
Twitterfall - View a 'waterfall' of tweets of the current trends on Twitter in near-realtime with a really simple interface. Unlike other sites, Twitterfall does all the searching, causing no additional stress to Twitter regardless of the number of people on Twitterfall.

Visualization

GeoTweeter - View live Geotweets from around the world. GeoTweeter iPhone app lets users show followers their exact location with a configurable map icon, optional photo and star rating.
Vlaag - Twitter Tags Aggregator and Visualization. See what people are Talking about in the Twitter world. Fastest Peoples' News Service.
Thwoa - A completely useless, yet captivating Twitter/Jaiku visualization tool.
Lexigraphs - Using salient words from an individual’s tweets, topical and temporal patterns are visualized to create a portrait of the author.
spy - Visualizes the conversations on Twitter, Friendfeed, Flickr, Blogs and more. spy can listen in on the social media conversations you're interested in. What do you want to listen for? Great for watching Twiter on a big screen.
TweepleCard - Creates a business like Tweeple Card (pdf document) you may print and distribute 2 your friends. It´s funny....
Twitnest - Visualizes twitter's social graph as a graph. See who's following who. Auto-group, automated groupping of users in social graph.
TweetStats - Visualize your Twitter history, showing how often you tweet per month, per day of the week, who you reply to the most, and what applications you use. Retrieves your Twitter timeline as far as Twitter allows. Also shows a TweetCloud and how many twooshes you've had.
twittermap is a Google Maps mashup for Germany which lets you search something on a map, displays all your followers on a map or shows you People in a proximity of a city. It also displays other Regions if you wish on other TLD's like .tv (Worlwide), .us, .com.mx, .eu, .es, .fr
Tweetsmap is a german Twitter Map that is not based on GeoIP but direct inputs. Every user that wants to appear at the map has to insert his position manually, so the position at the map is as exact as possible. Find Twitters near you today! Soon multilangual!
Twittersphere Visualizer is a visual representation of the Twittersphere. The flash application periodically requests the latest tweets from Twitter and then animates them in the sky.

Weather

Weatherizer - Regularly updates your twitter background and/or avatar according to your local weather. Create your own weather themes to share.
Tweeteorology - displays tweets about the weather, allows users to search/limit by location - by Magical Pork

Other

Wantz.it - Lets you maintain a wish list through twitter, by tweeting @dowant [ URL ] [ optional comment ] you automatically update your wish list with that item. The wish list can also be easily shared on a blog or through the Facebook app.
TwitterCompressor is a small application that will compress and capitalize your text. The space on Twitter is precious - don’t waste it!
TwitterBEIS - Silverlight 3 OOB (Out of Browser) web and desktop App, hostted by Microsoft Windows Azure.
tagal.us - Tagalus is the largest and first hashtag resource for Twitter. Allows getting and setting of tags via web, twitter, or an API

HashDictionary - the hashtag dictionary for Twitter. Update your own hashtags wiki style.
TwitaYa ! - see what your most recently active friends have been saying, search their updates, and surf to a new user efficiently without page reload. Includes a celebrity directory.
Pornstar Tweet! The daily lives of the hottest pornstars -- all in one place.
Tweetizen - Discover tweets that matter to you. Create groups based on your interests and filter tweets that you want to read. You no longer will have to scan through thousands of tweets to find something useful. You can find groups on technology, jobs, gossip, news - think Digg.com, but for tweets.
Twitter Score - Ranks your Twitter profile based on different stats from your Twitter page. Another clever thing that TwitterScore does is to remember your profile and see how you compare against previous months to show you whether you’ve improved or got worse!
adCause - Advertise on twitter. Buy and Sell ads on twitter. Keep the money or donate a percentage to your favorite causes. (@adcause on twitter)
CheepFlow - Twitter-enabled SharePoint Workflow to address communicating changes from within a protected SharePoint Site. Tweets announcement content types as regular updates, documents with updates including the name of the document and bit.ly-shortened urls.
CrestrTwitr - The first Crestron twitter client. Allows your crestron automation gear to send and recieve Tweets from Twitter.
Twitkut - Display your recent tweets on your Orkut profile page. Also, view the tweets of all your Orkut friends.
Twittad - Monetize your Twitter profile while not disturbing the conversations on Twitter. Either place profile or opt-in to Advertiser campaigns which allows for branding of your Twitter page.
WhatsYourTweetWorth - From @Twittad - get a feel for how valuable you might be to advertisers on Twitter. A fun add-on site to the Twittad offering.
Tweet Link Monster Get an Atom feed of all of the links that your friends tweet. That way, you can read them at one time in your feed reader when you want to do so. Never get a link tweeted via SMS while away from the Internet and then totally forget about it again.
Twootball -- Have you ever wanted to sit down to a NFL match with a few beers and your laptop and tweet away to your favourite team with you fellow supporters? well a new site called Twootball allows you to do just that. From the main page of Twootball you will see the stream of everything that’s going on. Down the right hand side are the latest matches to be played, clicking on them will take you to the game screen where you can see the latest tweets coming in about the match.
FreeTweets Cool collections of hottest Twitter Backgrounds, a totally refreshing sweet treats so that you can Tweet Fabulously! by Focusguys
TweetRemote Determines tweets' content-types based on hashtags and formats accordingly for aggregating and integrating with a blog.
CelebrityTweet! Stalk or follow celebrities on Twitter as they tweet in real-time.
Social Event-based group twittering. Turns any twitter account into an event account where all attendees can message each other.
MsnToTwit 'MsnToTwit' is a msn add-on. Msn Personel message on Twitter account.
Twitterverse 'Twitterverse' was a prototype developed to offer graphical representation of social networks formed through usage of the 'Twitter' service. It offers a graphical user interface enabling efficient navigation of the user's social network and user's friend's social networks. Click here to read more
TwitterSnooze Hit the "snooze" button on your "verbose" Twitter friends by temporarily unfollowing them.
StrawPoll Tiny daily polls in 140 characters or less. More info at @strawpoll
Cullect Collaborative feed reader optimized for Twitter; sign in with your Twitter id, post to twitter. Cullect also auto-expands shortened urls. More info at @cullect
Gridjit - Gridjit is a social portal that presents a Twitter user's friends and conversations in a grid layout with drill-down features through networks via @tags and links.
Diabetes Tracking for Twitterholic Diabetics -- This is SugarStats.com integration with Twitter to allow diabetics to track their diabetes and input their stats via Twitter. It also includes automatically posting their blood sugar readings from their Sugarstats account to their Twitter account if they choose.
Twitter Ethnography This is a virtual ethnography of Twitter conducted by three students at Emerson College for a course called Studies in Digital Media and Culture.
30 Boxes has tight Twitter integration. After adding Twitter to your Web Stuff, you can view twitters from you and friends and you can post directly to Twitter.
A secure Google Gadget for updating twitter from your Google Homepage. Alternatively, an unsafe Google Gadget also exists, though you need to provide a 3rd party your login details.
If Suck a quirky little application to track everything that sucks in the world! Fully Twitter integrated. Tell the world what sucks at @ifsuck
Language Exchange on Twitter Language Exchange assistant on Twitter
MoniTwitter Monitors your website, posting updates to Twitter about load times and whether there is a problem or not. Subscribe to the Twitter account to receive updates about your site, notifications if it goes down.
Post Like A Pirate Have your text translated to pirate speak and post directly to Twitter.
PhoneTag Use any phone and your voice to update your Twitter timeline. In limited beta - first come first served.
Ququoo Turns Twitter into a timesheet, group your tweets to show how long you were doing stuff. To use, just befriend ququoo
Rss2twitter.com -- Add any rss feed to twitter via your twitter login.
Twash#Tag - HashTag - Complain about businesses and their customer service using a special hashtag: Twash#businessname / Twitter HashTag Directory
Tweet'l -- URL shotener, a la TinyURL, but it adds a Twitter client to make things handy.
TweetAhead -- Schedule tweets to be posted in the future
Twit2RSS - Read and reply to Twitter posts from your RSS reader. With this enhanced RSS feed, you may not need a separate Twitter reader.
Twitter Quotient - Humorous way to look at your Twitter stats (# friends, #updates) and calculate your Twitter profile! Are you a Twitter hero or zero? Keywords: twitter, quotient, statistics, metrics, index, profile, popularity
Twitcash -- "get paid per follower per post".
TwitKu -- A place to monitor your Twitter and Jaiku friends' posts in one place. Post to both with one click. "Refuse to choose!"
Twappi -- Daily Twitter mood. Cheer up a random sad twit.
Tweetdreams -- a Twitter dream journal.
Twerms -- Your latest 200 twits analyzed by Yahoo! Term Extractor.
Brabblr -- A metatool similar to twitku but with support for Twitter, Jaiku, Pownce and 10+ microblogging services. Post to one, several or all services at once and read your and your friends messages in one place.
Twitteria -- Answer questions beyond "What are you doing now?" , 100% Twitter based.
TwitThis -- add a "TwitThis" button to your website, or blog. Wordpress plugin included.
TwitterBuzz -- shows what sites people are linking to in Twitter posts, with relative popularity of sites.
TwitterChat An AJAX Twitter-Shoutbox for your blog or community.
twitterfeed.com -- "feed your blog to twitter". submit your blog's feed, and get your new blog posts twittered automatically.
Twitterholic - keeps track of followers/friends/favorites stats and sorts them.
Twitter Is Weird Displays random tweets as a conversation between two cartoon characters.
Twitter Zone -- Track URL and Words used on Twitter - List popular users and services.
What are people twittering about? Tracks the most common things/nouns found in the public timeline.
Yahoo! Pipe optimizes your Twitter RSS feed for posting to http://Tumblr.net. (still to do)
PingTwitter Ping your Twitter account from your blog so it auto updates when you make a new blog post.
Twitter on Foodry Restaurant review site has a "Send to Twitter" button to make twittering about a particular restaurant easy.
Twitget - A Twitter gadget -- a Windows Live gadget that shows your tweets on your Windows Live Space or the tweets of your peeps on Windows Live.
Inner Twitter - Inner Twitter asks what is in front of you? In answering you reconnect to your original happiness because to answer you must stop during your ordinary activities and turn your attention to immediate reality. A chime message is sent at selected time intervals. When you receive the chime stop. Listen. Briefly meditate. And then write about your experience.
TwitterWhere Makes it easy to post your location so that it's picked up by Twittervision.
LoudTwitter - Daily post your tweets on your blog. This is the exact contrary of twitterfeed. supports openid.
rss2twitter - rss2twitter is a freeware perl script that allow to post on Twitter every rss so also rss from Blogger!
TwitterNotes - Take notes anyywhere using Twitter, tag and read them whenever you want to.
Twitterest - Silverlight applet to show the ranking of your friends message count and other interesting stats.
Tweet'l - URL Shortener for Twitter.
Twype -- Automatically post your latest Tweet to your Skype Mood. Also track your Winamp listening and post that to the mood. Windows only.
SyncMood - Automatically updates your Tweet with Skype Mood.
@eventtrack - Tracking people in the moment, an extended topic, event, project, moment tracking system using Twitter as an interface but extending to multiple other services as well.
Joomla! Extensions - Add Twitter to your Joomla! web site. Joomla! is an open source content management system.
Twitter Packs - Find new people to add on Twitter using Twitter Packs!
Twitter SPY - Twitter SPY displays the Twitter public timeline in a fancy and addictive way!
CheckYesOrNo.info - Create simple yes or no polls and use the 'send to twitter' feature to easily share with your twitter buddies. It's like those notes you used to get from girls back in junior high.
Twitter.PollDaddy.com - Create Polldaddy polls and post them directly to your Twitter stream.
Twanslate (Twitter Translator) - Translate into multiple languages all through Twitter. Great for on the go translation when you just have your mobile phone. Just follow @twanslate and send a direct message like "d twanslate fr Where is the bathroom?". By @mdjensen
@checkdomain - Check for domain availability right from Twitter! Just follow @checkdomain, then send a direct message like "d checkdomain somedomain.com". By @mdjensen
Dislikr will create a bar graph based on @ messages/references for a provided user. Usage: http://dislikr.com/user_name
Clickbank Mall plugin for Twitter - Provides ecommerce capability
Twuzzer Twitter/GoogleMaps mashup, also featuring the Fail-Whale massacre.
KnolMe A URL shortener for Twitter users. Use your twitter username as part of the short url. (example: http://knol.me/al3x/1)
Sad Statements Sad Tweets are automagically illustrated via flickr.
Twiffid fetches the headlines of the websites listed in the profiles of your Twitter friends and shows them to you in a Twitter-like format. RSS feed and most clicked headlines available too.
FriendFeed Finder Find out if who you follow is on FriendFeed too. By @mdjensen
Dwigger Threaded conversations and voting for Twitter
Tweetwants You want stuff. Stuff is cool. You want it so much, you tweet about it. This is a collection of stuff you want.
Tweetfails Sometimes people get these big fancy ideas and attempt to pull something off. Sometimes it works, but that is boring. It's much more awesome when it fails. And when it fails, people tweet about it. This is a collection of stuff that fails.
Modelfolios online community that sends alerts of public site activity to twitter.com/modelfolios.
twopular - most popular trends on twitter aggregator
Twoogie, M.D. - Update your Twitter feed, Doogie Howser-style!
GTalkTwit - Update Twitter from your Google Talk (gTalk) status message
LastTweet - Put your recent Twitter updates in Last.fm's sidebar using one of the four available styles
TweetValue - How much is your twitter profile worth? By @jonasl
vttwitter - Twitter module for vtiger CRM
@myflightinfo - Get your flight status by sending a direct message with your flight info
sadakmap.com/twitter (with OAuth support) - 03/2009 - Post updates on a map. Updates can be longer than the 140 chars that Twitter allows. Your followers will see a link in your update that will display the location on the map you twitter'ed from. Also search for messages on Twitter by clicking on the map.
TwTip - Lovely tip tweets around the world
Writer's Database - Submission tracking app for writers, features Twitter integration. Let your followers know when you've sent out a new story (or batch of poems) for publication.
Viral Tweet Generator - A twitter application that has been designed to give you the possibility of creating a viral wave of tweets through your followers as well as your followers followers.
Twurfer - Twurfer combines the power of Twitter and you as a surfer. Now you can get and send surf reports with your cell phone! Plus you get your own surf report web site for showing off your surf reports, surfing photos, and links to your favorite surf sites. Launch your own surf report web site now!
vBTwitter - A Twitter integration with vBulletin that allows, as of v1.0, "Tweet This" functionality for posts and threads. Planned expansions are to occur to expand the product to support most of Twitter's features.
TweetIRC - A IRC style Twitter interface (in early stages)
ThinkClimbing - find and connect with climbers on Twitter
What The Hashtag?! - A user-editable encyclopedia for hashtags found on Twitter
TweetBackup.com - Backup all your tweets and friends. By @jonasl
YiqYaq - Online community radio turns twitter feeds into audio channels, so you can hear tweets via text-to-speech, blended with news, music, and other social audio. How-to here and here.
TwitteReader - gives Twitter a Google Reader look, with the ability to mark tweets as read/unread.
Greenknob SWIG - SWIG is an acronym for 'Some Ways I Green'. Send a tweet to @greenknob SWIG: ,(i.e send a reply to greenknob followed by the letters 'S','W','I','G',':') and you will see it displayed at http://www.greenknob.com/swig/. See how different people in various parts of the world do their bit to conserve.
BettingTwits -Tweet on about sports and sports betting including the NFL, NCAA, NBA , MLB, tennis, golf and more.
Ramamia – Ramamia helps you keep in touch with your family through simple and private family sharing, connects to Twitter.
TwitterToFeed – This tool helps you to represent your twitter timeline or your friends timeline as a RSS feed.

Mobile Applications

QuaseFree - é a primeira aplicação brasileira que permite a atualização do twitter pelo celular. Além disso possibilita o envio de mensagens diretas entre usuários do twitter.
TwitterView - A simple iPhone App that gives the best viewing experience for your twitter updates. Full Landscape support for viewing, posting, direct messageing, and inline web browsing. Excellent for sitting down and Flicking between your tweets with a swipe of your fingers.
Simple Tweet - a simple iPhone application from rhinoapps.com. It allows you to explore, post, remove friends and add friends from your iPhone.
FlyingBird's mobile - a collection of personal productivuty applications for Symbian smartphones, e.g. Money Manager, Car Expense Manager
Twit Tuner - a small and free utility app for the iPhone to browse the current top ten twitter trends.
Book Price Check - a simple way to check book prices via reply and direct message to your mobile device.
twe2.com - is a Free mobile service that allows you to receive your Twitter Alerts via SMS worldwide to any mobile device.
Statuso - An iPhone application which allows you to update toggle on/off posting your status updates to twitter, facebook, friendfeed & yammer
TwitterMobile - A simple to use mobile application that gives the user a portal or gateway into the Twitter world of blogging and instant messaging.
Twittelator Pro - A best of breed twitter client for the iPhone and iPod touch, Twittelator Pro features myriad features sure to satisfy even the most seasoned of tweeters.
Snaptu is a free mobile service that offers you a selection of fun and userful mobile applications, including Twitter, Facebook, Sports and much more. Works on most Java phones.
Twootball iPhone - iPhone application that tracks the scores of the NFL games and the twitter messages about those games. It also functions as client to send out tweets.
Twti2go - A fast and clean Twitter client for Android powered devices. It has search, photos, URL shortener, etc.
Dabr - The best Mobile Web App for Twitter to date. Described as 'm.twitter on steroids', dabr is ad-free and provisioned for S60, Android, the iPhone and Blackberry... http://dabr.co.uk from your mobile browser
Twitroid is the first full-featured twitter client for Android mobile phones, including search & photo posting.
GPS Twit is an application for the iPhone and Windows Mobile that you can run on your phone to make it easy for your friends to find you. GPS Twit answers the question, "Where are you and what are you doing?"
Quakk is a very small, fully-featured and very attractive Windows Mobile Twitter application.
Tiny Twitter is a free and full featured Twitter mobile client that runs on Windows Mobile Pocket PC and Smartphone devices (a native Windows Mobile client) and Java enabled devices (a J2ME client).
TwitToday is a free Windows Mobile 5+ Pocket PC/Professional Twitter widget for posting Twitter updates from the Today screen
Twobile is a free Windows Mobile 5+ Pocket PC/Professional Twitter client that allows users to use nearly all the features of the desktop web-based version of Twitter!
ceTwit is a free windows mobile 6 native twitter client for windows mobile phones and smart phones
Locify with Twitter service - free. Locify adds gps location to your Twitter update from your phone and more - see public, user and friend timelines, profiles, ... Location Matters! Locify your Twitter.
twitter on Mobio widget FREE DOWNLOAD GetMobio lifestyle portalhas several mobile widgets including twitter on Mobio! Supports 100+ mobile phones [Java + BlackBerry + Windows Mobile phones]. twitter on Mobio widget allows you to update your twitter timeline, view the public timeline, and get updates on your friends timeline all from within a fast and easy to use widget interface. You've got to check this out!
twitter on Mobio + Cricket widget FREE DOWNLOAD The definitive portal for the global Indian has several mobile widgets including twitter on Mobio plus Cricket (IPL, test, ODI), Economic Times, Times of India and more! Supports 100+ mobile phones [Java + BlackBerry + Windows Mobile phones]. twitter on Mobio.in widget is the same as the one in the US GetMobio portal (see above).
Cricket action on twitter Check out the cod at [http://www.theyagar.com/2007/12/02/twitter-action-code/]follow all the indian team's cricket scores from your mobile with plusmo cricket feeds
psychzzz - An easy 1 STEP Twitter Updater for your mobile phone. Supports most major mobile phone browser. XHTML-MP verified and able to support Japanese and Chinese characters as well.
SQIJ -- Sqij is a Windows Mobile application that supports mobile web applets. The Twitter applet makes using Twitter easy, and you can even get alerts of timeline changes and direct messages.
Abiro Jitter supports most features available via the Twitter API with easy access to all features, and works on most mobile phones on the market that at all support Java. It uses your data connection instead of SMS for a lower cost and more functionality, and communicates directly with Twitter for better performance and reliability.
Twitteresce allows Java-Enabled phones (there is a list on the web site) to receive and post tweets. Much more convienent than SMS alerts!
Twitter2Go provides a WAP or xHTML-MP interface that works on Palm, Pocket PC, BlackBerry, and almost any other mobile phone or PDA device. No software to install!
Twitter deBolsillo tested on a Windows Mobile PocketPC. No software to install! In Spanish.
Twapper from 30 Boxes is a WAP browser for Twitter with image support, so you can keep up with Twitter on your mobile without the constant barrage of SMS interruptions. The 30 Boxes blog provides details of Twapper v1.0 and Twapper v2.0b. v2.0b now lets you post Twitter updates.
Twittai is designed for Java phones, which supports most of the twitter functions like Reading Tweets (no 20 tweets limit), Update, Reply, View Archive, View Replies, View Direct Messages, View Friends' Updates and Profiles, Adding Favorites, Delete Tweets, and etc. And Twittai is now compatible with more than 200 mainstream phones and Windows mobile phones.
jibjib is a small and fast open source twitter client for any Java-enabled phones which requires only CLDC 1.0/MIDP 1.0 and CLDC 1.1/MIDP 2.0 in recent versions.
Twitter Answers enables you to Tweet answers and get responses. Like Yahoo Answers for Twitter, powered by Mosio.
Mobile Tweete is a lightweight mobile website. It features user timelines, replies, direct messages, users, favorites. It focuses on being a super-lightweight client.
m.slandr.net is an enhanced mobile site for Twitter, with: replies, direct messaging, users overview, search and geo.
twnkl.org is, like DABR and slandr, a mobile-enhanced front-end to Twitter. Features replies, messaging, conversation view, searching (with saved searches), blacklisting (remove people you don't want to see from search results etc) and other new features. Inspired by DABR, written from scratch in Python. Under active development!
moblf is a platform that enable access to FriendFeed via Twitter. Users can perform the following: Post direct messages on FriendFeed, Get updates from people they are following on FriendFeed, Get updates for a particular user they are interested in.
Twitterpation is an iPhone application that lets you record mixed voice-and-text Tweets.
Hahlo is a mobile application for using Twitter, great for the iPhone too.
HelloTxt is a mobile version of HelloTxt Status Manager.
uTweetMe is a J2ME mobile application for posting Twitter updates.
iTwtr is an open source Twitter client for iPhones. The main thing that sets iTwtr apart from other iPhone Twitter clients is its capacity to download content in the background and save it for future viewing.
Blackbird, a Twitter client for BlackBerry smartphones.
TwitterGPS, a location-aware Twitter client which runs on smartphones which support Global Positioning Satellite (GPS). Users can exchange messages containing location links and then view these as maps - either on the phone or using a PC browser.
PockeTwit A twitter client for Windows Mobile devices. Features a unique UI, GPS integration, Capture photos and send to twitpic, and lots more by Ricky Deez.
TwitterText (powered by SmartTouch) TwitterText allows Windows Mobile 6 users a web-like rich interactive Twitter experience through SMS. SmartTouch is a mobile widget-platform that provides an exceptional SMS 2.0 experience for users to enjoy seamless access to branded content and services such as Facebook and Google w/out the need for a data plan!
Twibble mobile is a twitter client for Java enabled devices. It supports all important twitter functions, uploading of photos via twitpic, GPS, and much more!
Twitter Reader is a Web Runtime widget for smartphones built on the S60/Symbian platform (like these from Nokia). Read basic tweet feed, post tweets and @replies. Can also set a custom prefix for your tweets.
Synble is an mobile/web hybrid application for Nokia Symbian/S60 devices. Among other things, Synble can send your @replies and DM's as a text messages to your phone for free. More info...
Map My Tracks shares your outdoor activities in real-time and updates your location on Twitter.
SimplyTweet - An iPhone Twitter client focus on conversations.
Touch Poet an Iphone/iPod Touch app which let's you make poetry and publish it to Twitter
twitstar is a Twitter app currently under development for Windows Mobile 6 devices, and could do with some testers!
Coffee Buzz is the Coffee Social on your iPhone - Displays nearby Coffee Locations + All the nearby and everywhere coffee talk from Twitter. Features @replies, Twitter location updates (e.g. 'Starbucks, Boulder County.' not just "iPhone: 51.2342423, 112.01230123"). Automatically composes a 'Having Coffee' tweet using your location and favorite drink.
YiqYaq iPhone is a mobile version of YiqYaq community radio, allowing twitter channels to be listened-to via text-to-speech audio blended with news, music, and other social audio streams.
Gravity is a Symbian S60v3 and S60v5 (touch-screen) client with support for multiple accounts, Identi.ca, TwitPic, and intuitive search features that recognize @replies and #tags in posts, as well as tweet queueing in the event of disconnection from the network.
Twittix is another Symbian S60v3 and S60v5 client with search, auto-update, and support for portrait and landscape mode, and the use of the accelerometer.
Zen Jar is an iPhone app that facilitates anonymous conversation between iPhone users by way of deep, interesting or otherwise meaningful thoughts. Thoughts posted to Zen Jar are cross posted to Twitter.

Other Interfaces

any.io Finger and DNS Gateways - provides an interface to reading statuses via both the finger and DNS protocols.

Jobs

JobMotel - Discovering and posting tech jobs to twitter.

Comments

I'm adding Twitter Blacklist (http://twitterblacklist.com) here, but I wonder if there needs to be a "Services" page for things like this, Tweetscan, etc.

Just added Bigger Twitter, it's a service a bit like Twitzer

Added uTweetMe (http://utweetme.navetke.ru) to the Apps page under Mobile Apps.

Oops, thanks for fixing that for us. Apologies to the list on that mess up. We got a timeout when I committed our changes (which I thought was strange) but never went back like we should have and made sure things we OK all the way through the list. We will be extra careful next time :-)

Added Twellow.com to Search Engines under Web section.

http://www.juegos-gratis-gratuitos.com juega en mi sitio de juegos, si no te gusta.......

este es mi sitio de juegos de vestir chicas http://www.juegosvestirjuegos.com

y este otro es juegos de accion http://www.nitrojuegos.com

I am unsure about where to include http://www.quoteurl.com on this list, I see that a similar app (LinkBunch) is under "Posting and Alerts", so I am putting it there but please feel free to move it to "Others" or any other category you guys find appropriate. :)

I don't know where should I put Twitnest (http://twitnest.appspot.com)

It visualizes twitter's social graph as a graph with automatic grouping.

Added Android software tweets(http://ihaveandroid.com/twitter/) to Search engines

Added Twittley(http://twittley.com) - First Twitter social bookmarking site..Share interesting news with Twitter users

I am adding TwitterPray (http://www.twitterpray.com) under search engine apps. My app is a real time snapshot of what people are praying about on Twitter and what people are requesting.

Source: Twitter Fan Wiki

Sexy Scandals

Twitter Tools

Desktop Applications

Windows

Mac

Linux

Multiplatform

Second Life

Other

Web Applications

Ad Networks

Analytics

Badges and Widgets

Business

Dating

Diet and Exercise

Entertainment

Games

Groups and Organizations

Follow Management

File Sharing and Storage

Gallery

Local

Marketplace

Media - Photos and Videos in Tweets

Multi-account Management

News

Nightlife

Personal Finance

Printing

Posting and Alerts

Productivity

Search Engines

Shopping

Travel

Trends

Twitter Status

Visual

Visualization

Weather

Other

Mobile Applications

Other Interfaces

Jobs

Apps

Page Tools

Insert links

Comments

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