Narrow - Narrow helps you build a targeted audience and increase your influence on twitter.
YoruFukurou - YoruFukurou (NightOwl) is a Twitter client for Mac OS X, designed for Twitter addicts.
Follow3rs - Follow3rs enables you to add more followers to your Twitter account and become prominent in no time at all.
Talon for Twitter - Elegantly designed, ad-free Twitter experience for Android
Followerion - Followerion is the most trusted site regarding how to get more followers on twitter.
Echofon for Twitter - Download Echofon apk 3.1.3.3 for Android. Echofon for Android - A super clean Twitter app