iUnfollow - Simple and free! Unfollow twitter followers who don't follow you back. Get more followers with fan tracking. Over 100,000,000 unfollows performed.
SE Ranking - All-in-One cloud-based SEO software for agencies, marketing teams and webmasters
Unfollower Stats - Unfollower Stats is a free third party twitter app to track followers/unfollower stats. Find out who unfollowed me on twitter!
DeskAlerts - Send alerts to any corporate device: PCs, phones, tablets, etc.
SocialDog - SocialDog is a social media management tool where businesses and individuals are able to manage their Twitter account smart and efficiently.
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.