Hypefury - No idea what to share on Twitter?
Narrow - Narrow helps you build a targeted audience and increase your influence on twitter.
What to Tweet - Never again run out of Tweet ideas.
Follow3rs - Follow3rs enables you to add more followers to your Twitter account and become prominent in no time at all.
Toolset.com - The complete and reliable plugin for managing content types in WordPress.
Followerion - Followerion is the most trusted site regarding how to get more followers on twitter.