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An app that lets you select certain key words or phrases and tells you how often they appear on the site you select.

An app that lets you stay on top of who the top Twitter personalities are.

An app that informs you of what Twitter is doing every day.

An app that crawls hundreds of tweets every minute and extracts the words which are mentionned more often than usual. The result is displayed in a Tag Cloud, using the following rule: the hotter, the bigger

twitQA is an application where you can ask questions and other tweeters can answer them for you.

iKnowTweet.com is the perfect site for finding out information, posting questions and providing answers.

Twitulater is an Adobe AIR microblogging client that currently supports Twitter. Its aim is to make life easier for power users who are constantly bombarded by messages from the many people they follow, through automatically splitting the tweet stream into different categories based on content rather than whom the messages are from.

TwittEarth shows you some live tweets and where in the world they are being posted.

Twilert is a Twitter application that lets you receive regular email updates of tweets containing your brand, product, service, well any keyword you like really.

TweetChat helps put your blinders on to the Twitter-sphere while you monitor and chat about one topic.