Gwibber - Gwibber is an open source microblogging client for GNOME developed with Python and GTK.
Janetter - Janetter is a Twitter client application. Faster, smarter, and more powerful.
TweetDeck - TweetDeck is your personal browser for staying in touch with what’s happening now.
Talon for Twitter - Elegantly designed, ad-free Twitter experience for Android
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.
Echofon for Twitter - Download Echofon apk 3.1.3.3 for Android. Echofon for Android - A super clean Twitter app