Tweetastic - Better Twitter analytics, scheduling and more
ilo - Premium Twitter analytics
Followerwonk - Followerwonk by Moz is a Twitter analytics tool to help companies better understand their Twitter followers.
Social Viewer - Find out your follower's most popular locations, interests, frequent used hashtags and twitter handles and more.
ClockTweets - Schedule, analyze, and stalk challengers on Twitter
Textalytic - Free point & click text analysis in the browser