Followerwonk - Followerwonk by Moz is a Twitter analytics tool to help companies better understand their Twitter followers.
ExportData.io - Export Twitter data for your business needs.
Twitonomy - Twitter analytics and much 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.
TweetFeast - Download Twitter followers to Excel, CSV, and JSON.