Followerwonk - Followerwonk by Moz is a Twitter analytics tool to help companies better understand their Twitter followers.
ilo - Premium Twitter analytics
Twitonomy - Twitter analytics and much more.
Tweetastic - Better Twitter analytics, scheduling and more
Accountanalysis - A tool to evaluate Twitter accounts
FollowerAudit - FollowerAudit is a platform that allows users to check their fake followers and track the follower growth of any Twitter Account.