Embold.io - Peer Code Review
Gwibber - Gwibber is an open source microblogging client for GNOME developed with Python and GTK.
Hibari - Hibari is a simple yet powerful Mac Twitter app that blocks unwanted tweets and combines important tweets into a single timeline.
TweetDeck - TweetDeck is your personal browser for staying in touch with what’s happening now.
Daisy - Get help creating healthier and more productive habits
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.