554 twitter tools and counting...

Twitter Digest

Lets you read Twitter updates in a more manageable fashion. Just pick the usernames you'd like to generate a digest for, and you will see all updates made by them during the past full day (GMT). At midnight, a new set of updates rolls over.

Twitter Snooze

An app that allows you to put some of the people you are following on Twitter on a snooze function if you don't need to receive updates from them at all times.

My Tweeple

An app that lets you manage who you follow on Twitter. You can follow or unfollow with one click

Less Friends

An app that will show which people have unfollowed you on Twitter.

Does Follow

An app that tells you if someone is following you on Twitter.

Twitter 100

Allows you to group your followers on Twitter easily. You can manage it so that it lets you show the latest 100 posts of your followers.

HockeyTweets

HockeyTweets is a website built on top of Twitter. It focuses on hockey, letting users discuss their favourite hockey teams in an interface similar to that of Twitter, but with some additional features like graphs, hockey trends, top hockey talkers and the ability to filter trends and messages by team.

Twitterator

An app that allows a Twitter user to "follow" a bunch of other Twitter users in one swoop—a Twitter friend list generator.

Twootles

An app that lets you search Google and Twitter at the same time.