Twiangulate - Analyzing Twitter's hidden networks for influence and recruitment.
ExportData.io - Export Twitter data for your business needs.
Followerwonk - Followerwonk by Moz is a Twitter analytics tool to help companies better understand their Twitter followers.
FollowersAnalysis - Followersanalysis helps you analyze Twitter followers, export followers list in CSV, compare multiple Twitter accounts and their followers, track followers growth rate, and search Twitter profiles.
DataSift - DataSift is a social data platform that enables companies to aggregate, filter and extract insights from public social conversations.
Twitonomy - Twitter analytics and much more.