• 21Tweets - Create a new habit and change your life. 21 tweets in 21 days and you are used to another habit. Works a little like a personal coach for you to support you in your change. With calendar statistics
  • BigTweet - BigTweet installs as a bookmarklet and allows you to post to Twitter from any web page. Choose a classic 140 character update, or a 240 character tweet. Insert special Unicode characters and shorten URLs with the Bit.ly API right from the bookmarklet window. Automatically capture the current page title, URL and any highlighted text. No registration is required - only Twitter login credentials are needed.
  • DreamTweet - Anonymously post your dream or nightmare for the world to see! A live Twitter integrated dream log.
  • Followize - A trimmed down, fast and efficient web app for reading tweets. See the latest update from each person you follow, explore replies and timelines easily. To Twitter as Gmail is to email.
  • HootSuite.com - Manage multiple Twitter profiles, add multiple editors, pre-schedule tweets, and measure your success with “click-through” stats.
  • MoochFly - Keep track of things you lend to your friends. Sends direct twitter message reminders to help people remember to return the things they have borrowed.
  • Philtro - Rate articles and tweets so you can find the most interesting, relevant posts first. It’s like a spam filter for your RSS & Twitter subscriptions.
  • twAitter (Now in Alpha) - A full Twitter web client with a comprehensive scheduling platform.  Schedule tweets to send at anytime (recurring included).  Manage your scheduled messages with an Outlook style Twitter Calendar. (www.twAitter.com)
  • Readmytweets.com - Read other people’s tweets and others will read yours.
  • TweetMyLink.com - Post your link for the whole Twitter world to see.
  • TweetLater.com - Schedule tweets, auto-follow and auto-welcome messages, and email keyword alerts.
  • TweetOClock.com - Find out the best day and time to send anyone on Twitter an @reply or direct message.
  • TwiST — Twitter Search Tool, time saving tool for searching Twitter
  • Twit2Do - Use twitter to manage a to-do list. Update via Twit2do.com or by sending an @twit2do reply on twitter.
  • Twitter Pigeon - Twitter Pigeon is a new way to ask questions using Twitter. Keep all of the answers to your questions on one page with a unique URL that you can share.
  • TwitterJobcast - Browse by city to see who is hiring on Twitter or search using your city and state or zip code. Includes cities in the U.S., Canada, Australia, and the U.K.
  • Twitrans.com - Translate Your Tweets to Any Language by Human Translators. @twitrans help for more info
  • Tweetreplies.com - Have your @replies send directly to your email in real time, the emails are sent out every 10 minutes.
  • Twtpoll - A simple survey/poll twitter app. Create polls. Share it with your tweeple via a short url. No username/passord required. (By @twtapps)
  • Tweetvisor.com - Twitter interface with automatic refresh for real-time updates about favorite topics, news and tweets. Currently supporting groups and friend tags that filter friends timeline, replies and DM sidebars, hot topic box to monitor favorite topics, inline video replies, manage multiple accounts.
  • TwitExplorer.com - A full featured Twitter web client which allows you to better manage your followers and find new interesting people to follow.
  • TwitWall.com - The Instant Blogging Companion for Twitter. Blog with video, audio, widgets, and long text; automatically posts Twitter status updates.
  • Twttrstrm.com - Ask a question, and have other tweeters contribute answers to your Squidoo lens.
  • Twtask.com - create very simple task lists by @reply or DM @twtask
  • TweetActive.com - Find out how active you and your friends are on twitter, using a unique and dynamic number TweetActiveIndex
  • TrackDailyGoals.com - Keep track of your personal productivity by using the #dailygoals hashtag combined with this site.
  • Tweetizen - Discover tweets that matter to you. Create groups based on your interests and filter tweets that you want to read. You no longer will have to scan through thousands of tweets to find something useful. You can find groups on technology, jobs, gossip, news - think Digg.com, but for tweets.
  • Twups - Twitter news aggregator, allows you to follow all your favorite subjects in one place. You can even suggest topics!