HootSuite - Enhance your social media management with Hootsuite, the leading social media dashboard. Manage multiple networks and profiles and measure your campaign results.
Janetter - Janetter is a Twitter client application. Faster, smarter, and more powerful.
OfficeSpace Software - Create a better place for everyone.
YoruFukurou - YoruFukurou (NightOwl) is a Twitter client for Mac OS X, designed for Twitter addicts.
Tweedle App - Notion is nice but sometimes all you need is an app like Tweedle.
Tweeticide - Tweeticide – Delete All Tweets is a commercial app that enables you to delete all of your tweets at once.