Sidebird - Notion to Twitter thread.
Narrow - Narrow helps you build a targeted audience and increase your influence on twitter.
TweetNest - Build your real Twitter audience 80% faster
Followerion - Followerion is the most trusted site regarding how to get more followers on twitter.
Maker Swipe File - 100+ high-performing Tweets to help you grow your audience
Follow3rs - Follow3rs enables you to add more followers to your Twitter account and become prominent in no time at all.