MyCleenr is a unique way to sort your friends by their last tweets. It allows you to get rid off all the inactive and useless accounts that you are following!   Visit MyCleenr here

    Qwitter e-mails you when someone stops following you on Twitter with a message like this: John Gruber (gruber) stopped following you on Twitter after you posted this tweet: What’s the difference between Arial and Helvetica?   Visit Qwitter here

  Unfollow Tweeps who have not posted Tweets recently.   Visit UnTweeps here

  Follower Graphs and Notifications Twitterless will notify you when somebody stops following you and tell you who it is and your follower history is graphed out over time. Find out why you’re losing or gaining followers.   Filter Followers and Search Through Their Posts Twitterless gives you a more descriptive view of your followers. [...]

  Twitter Karma is a Flash application that fetches your friends and followers from Twitter when you click the "Whack!" button, then displays them for you, letting you quickly paginate through them. By default, the list contains all your friends and followers and is sorted by last update, showing those who most recently updated first. [...]

  Get ready to take control of your twitterstream. twalala is a client for Twitter that allows you to control what you see, and more importantly, what you don’t see in your twitterstream. Using twalala, you can filter tweets out of your stream by keywords and phrases or mute individuals who get a bit too [...]

    What is Twitoria? Clutter is pervasive. Twitoria tries to reduce Twitter’s clutter (clitter, if you will? lol) by revealing friends you are following that haven’t posted an update in a while. It can, for example, easily track down those pesky friend spammers that post no content, or people that have abandoned Twitter for [...]

  Who are you following that’s not following you back? Who’s following you that you’re not following back? Find out!   Visit FriendOrFollow here

  Wouldn’t you like to know more about the people who follow you on Twitter? With New Follow Notify you can automatically send them a Direct Message with a link to a questionnaire. That questionnaire asks for basic information such as how they found you and why they decided to follow you. When they fill [...]

    DoesFollow allows you to see who is following who.   Visit DoesFollow here