Tweeticide - Tweeticide – Delete All Tweets is a commercial app that enables you to delete all of your tweets at once.
Janetter - Janetter is a Twitter client application. Faster, smarter, and more powerful.
Twicca - Twicca is a Twitter client for Android that is simply awesome. Features: * Notification
YoruFukurou - YoruFukurou (NightOwl) is a Twitter client for Mac OS X, designed for Twitter addicts.
Plume - App for writing documents, scripts, books and more.
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.