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.
Twicca - Twicca is a Twitter client for Android that is simply awesome. Features: * Notification
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.
Tweet Sponge - Tweet Sponge – UnFollow Stats is a powerful, lightweight application that keeps track of all of your followers and shows you who unfollowed as well as enable you to unfollow them back quickly.