SongTwit

SongTwit - share music on #Twitter

TwitHive

TwitHive - 100% Web Browser based application. Monitor Tweets across Multiple Accounts. Track Trends and Brands mentions. Interact with your Twitter Contacts. Keep your #Twitter Passwords secure and safe

TwittGeek

TwittGeek is a #Twitter application that automatically follows 200 targeted people based on keywords you write

TwitterContd

TwitterContd is a new service that lets you send tweets that are longer than 140 characters

Twitbrain

Twitbrain - "tweet the answer to the challenges and earn Restecpa"

Twitter Match

"With #Twitter Match you can find new people based on your interests"

Happn.in

Happn.in - "collects and aggregates popular phrases used on #Twitter within 20 miles of major cities. The five most popular phrases each hour are posted to this site, and are tweeted three times a day to the happn.in Twitter account for each city"