Gwibber - Gwibber is an open source microblogging client for GNOME developed with Python and GTK.
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.
Choqok - Choqok - KDE Micro-Blogging Client The name comes from an ancient Persian word, means Sparrow!
Twitterrific - Twitterific is an app that offers several functions and fun features for your Twitter account.
TweetDeck - TweetDeck is your personal browser for staying in touch with what’s happening now.
X (Twitter) - Connect with your friends and other fascinating people. Get in-the-moment updates on the things that interest you. And watch events unfold, in real time, from every angle.