Followerwonk

Created by the team at Moz, FollowerWonk is a tool for tracking, sorting, analysing and comparing your Twitter performance, both in terms of followers and in terms of general engagement levels. FollowerWonk probably needs a comprehensive update, but it’s still a usable tool for tracking your Twitter account. If you have a Moz account, you can also hook up with FollowerWonk, for even more control over what you do with the data. For anyone who uses Twitter but doesn’t yet track the performance and engagement of their account, FollowerWonk is still a good option.

http://www.followerwonk.com