Tweeticide - Tweeticide – Delete All Tweets is a commercial app that enables you to delete all of your tweets at once.
Twicca - Twicca is a Twitter client for Android that is simply awesome. Features: * Notification
Wali - Share and create watchlists
Tweedle App - Notion is nice but sometimes all you need is an app like Tweedle.
Mountaintop Data - A B2B marketing intelligence company providing marketing lists as well as data cleaning, data appending, and data maintenance services.
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.