Narrow - Narrow helps you build a targeted audience and increase your influence on twitter.
Janetter - Janetter is a Twitter client application. Faster, smarter, and more powerful.
MyFollowers - myfollowers.us is the answer to how to get more free followers on twitter. Start using www.
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.
Followerion - Followerion is the most trusted site regarding how to get more followers on twitter.
YoruFukurou - YoruFukurou (NightOwl) is a Twitter client for Mac OS X, designed for Twitter addicts.