I Found you is A Cli that helps you get all the users that you follow but they dont follow you back (Unfollowers)

Crawl and track followers count of Twitter account

CLI tool that checks who does and who does not follow you back on Instagram. It also checks who you don't follow back on Instagram.

Python script to find Instagram users not following back based on JSON data.

Tool for tracking Instagram followers and archiving data.

The successor of https://github.com/somnisomni/twitter-account-data-crawler, written in .NET C#

Instagram follow-back checker. Find out who is not following you back!

Twitter follower history

Get notified when an account gets a new follower