TweeMaid asks you to pay $15.95 to go through and clean you from following anyone that does not follow you back.  There is an exception list where you list who not to unfollow.  The system asks for your Twitter username, email and then presents oAuth for authentication purposes. Why you would be one of the ~271 people, at the time of writing, that are listed to have paid $15.95 for this service is beyond me.  We have tons of follower management... 

Twitalyzer is a must use analytics service for stat junkies! We highly recommend this service to those old and new to Twitter. In fact, you should check in with it every week or two and see how your stats are changing over time. Twitalyzer analyzes 5 different areas of your profile: influence, signal, generosity, velocity, and clout. We won’t explain what they all mean as the service does a thorough job of it. Nevertheless, the assessment...