Janetter - Janetter is a Twitter client application. Faster, smarter, and more powerful.
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.
HitFollow - HitFollow.info is the number one way to gets tons of twitter followers.
Talon for Twitter - Elegantly designed, ad-free Twitter experience for Android
Follow3rs - Follow3rs enables you to add more followers to your Twitter account and become prominent in no time at all.