TweetDeck - TweetDeck is your personal browser for staying in touch with what’s happening now.
Tweetbot - Sync your timeline across your iPhone, iPad, and Mac. Mute tweets by user, hashtag, tweet source, or keywords (including regex). 3rd Party support for image, video, read later, and timeline sync services.
Socialite - History Ever since we acquired Socialite from Realmac Software in December 2010, we have been planning on releasing a faster, more stable version 2.
Earthquake - Terminal-based Twitter Client with Streaming API support. Only supports Ruby 1.9 and later.
Oysttyer - Oysttyer is a console text-based command-line Twitter client and Perl platform, fork of...
Echofon for Twitter - Download Echofon apk 3.1.3.3 for Android. Echofon for Android - A super clean Twitter app