Twitter add-ons.
Apps, Widgets and Plugins - Windows
Pwytter - Cross platform Python Twitter client with Asian character support.
Twitteroo - Client with rurl URL shortening, clickable links and tweets, customization, and both public and friend timelines.
Chirrup - Twitter client with extensive Japanese language support. This sites in Japanese.
MadTwitter - A reincarnation of Twitterrific, except on Windows.
Twitter CLI - Post tweets via the command line for those times when an interface is just too much.
Twadget - Simple gadget that lets you view and submit tweets right from Vista’s Sidebar.
KipFolio Widget - Simple Twitter widget for KipFolio.
Twitter-Sync for Yahoo - Syncs Twitter status with Yahoo Messenger status.
TwitterYM - Simple Yahoo Messenger status updater.
Twessenger - Updates Live Messenger status to reflect latest tweet.
Twit4Live - Set status message as latest tweet, send tweets from within Live Messenger, and send tweets to contacts.
Apps, Widgets and Plugins - Mac
Twitgit - Read your friend’s tweets and submit your own, right in Dashboard.
Twitterlex - Dashboard widget that shows your friend’s latest tweets as well as allows you to submit tweets.
Twidget - Update your Twitter status within Dashboard.
TikiTwit - Match your iChat status to your last tweet.
Cross-platform Apps, Widgets and Plugins
Tweetr - Submit tweets, upload files, urltea built in, delete messages.
Spaz - Cross-platform client built with AIR.
Tweeter - Java based client with customizable UI.
Twinja - AIR based client which allows you to follow users on the fly.
Search and Directories
Twittersearch - Search Twitter and tweets by word.
Twellow –Billed as “The Twitter Yellow Pages” the first of several Twitter directories.
Browser Plugins
TwitBin Twitbin is a firefox extension that allows you to keep up with all of your Twitter conversations right from your browser sidebar.
TwittyTunes - A FoxyTunes addon that posts what you’re currently listening to Twitter.
Shareaholic - Share links and webpages via Twitter right within Firefox.
Tweetbar - Put Twitter on your Firefox sidebar.
Mobile
iTweet - A mobile Twitter site designed for the iPhone.
iTwit - Mobile version of Twitter made for the iPhone.
Tweeter - Twitter on your mobile phone while avoiding text message charges.
Jargong - Browse Flickr, do some social networking, but most importantly, check and publish tweets.
WildSets - Extensve Twitter app for mobile phones.
TwitterBerry - Twitter built for various BlackBerry devices. Update and view timelines with ease.
jTwitter - View timelines, enter updates, and more, all on your mobile phone.
TreoTwit - Easily check and update your Twitter right from your Treo.
Random/Other
Twittervision - See where in the world people are submitting tweets from, real time.
TwitThis - Allow visitors to your site to easily share a page or post via Twitter.
MoniTwitter - Receive important updates about your site via Twitter.
TwitterNotes - Share private or public notes via Twitter.
RSS2Twitter - Share any RSS feed on Twitter, and have new RSS items automatically be tweeted.
TwitterBuzz - Find out what is being most linked to on Twitter.
Twitterholic - Shows the top users and accounts on Twitter.
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