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An app that adds lots of features to improve the experience of using Twitter.

An app that tells you simply if Twitter is down for everyone or not.

Tweetburn is a directory of the top twitter users on popular topics.

An extensive list of all the terms and phrases that are used on Twitter in dictionary format.

Full of tips and ideas for making the most out of Twitter.

Shows you how to build your own Twitter counter.

Designed mainly for app designers but some good information for web programmers as well.

Exectweets is a website that aggregates tweets from business executives, and is organized by ad network Federated Media.

Tells you the tweet you made just before you gained or lost followers. The tweet could be the reason but might not be. Tweeteffect is still fun to use.

Thummit Quickrate is a sentiment analyis tool that displays whether a topic is thought of favourably or otherwsie. By analysing conversations on Twitter it dsiplays a Thumms Up which is positive or a Thumms Down which is negative.