RetweetFollow lets you search by keywords in URLs tweeted and to easily follow the retweeters.

TwitLuv.in – find how compatible you are with your friend and follower. Tweet the mathing results and get entertaining retweets from your followers.  to visit TwitLuv.in sorry it is offline.

It’s a new tool Twitter ranking of the most recommended tweeps based on the #followfriday recommendations. Check who recommends you and who you have recommended. @followfridaycom Click here to visit FollowFriday.com

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Want to win free gifts? Then tweet 4 Gifts is the app for you.

Power Twitter – Firefox add-on. Makes Twitter Better. Power Twitter adds features to the Twitter Web interface including:

twitt.it is a simple bookmarklet to tweet faster. On Twitter it adds a RT This! quick command to every tweet. On any other website it gets the selected text, bit.ly-es the url and redirect you to twitter.com ready to tweet. Click Here to visit Twitt.it

Its a new tool Twitter Directory with Twitter Lists – Search Twitter Lists, Businesses, Users, & Celebrities 

TwitComings Get relevant and real-time twitter reactions about your favorite events. Feel free to inform us about your events and let your followers be up-to-date by the events you join by your tweets. to visit TwitComings – sorry – the site was taken offline. TwitComings Get relevant and real-time twitter reactions

See who you mention on Twitter,

SpellBound for Twitter This Firefox add-on enables you to spell check your Tweets! Works much better than your built-in spell-checker, Just one click install. jundle.com/spellbound-spellcheck-your-tweets/ to Visit spell-bound-for-twitter is no longer online.

It’s a service that lets twitters know how much their twitters are worth.