If you or your business wants to grow and monitor a social media campaign, using twitter is essential.  Check out the entries on this list to get a good idea of whats out there:

Managing Twitter Accounts and Posts

  • TweetDeck is a great application for Windows, Mac, and Linux users which allows you to track any number of Twitter accounts by mentions, news, friends, and a lot more. You can also tweet directly from the dashboard.
  • UnTweeps lets you unfollow folks who haven’t posted lately.
  • My Cleenr is a similar app to clean your contact list up.
  • HootSuite, a browser based Twitter account manager.
  • Tweetlater and Twuffer both let you compose tweets and schedule them for later posting.
  • Tweetie manages your Twitter account on your iPhone.
  • Seesmic A desktop client to manage your lifestream from Facebook & multiple Twitter accounts.
  • CoTweet platform that helps companies reach and engage customers using Twitter.

Twitter Analytics

  • Back Tweets allows you to do a quick search to discover who is linking to you on Twitter (note — this will also include your OWN tweets).
  • Tweetstats is an online tool which lets you visually graph all your Twitter stats (tweets per hour, month, timeline, reply statistics and more!)
  • Twitter Grader lets you check out how influential you are.
  • TwitterCounter gives you web statistics on your follwers and Twitter rank.
  • Monitter lets you enter up to three keywords and see who’s posting on those topics in real time. Very cool application! Great way to find out who’s talking about you or your business as well.
  • Tweetbeep: sends you emails tracking mentions of you, your products, your company, or anything else you like.
  • Twitterless and Qwitter both tell you who stops following you and graphs your follower history over time.
  • TweetEffect lets you find out which of your Twitter updates made people follow you or leave you.
  • Just for Fun, Twitemperature lets you compare how “hot” or “cold” you against the entire Twitter universe.

Productivity

  • Tweetcube lets you send files on Twitter.
  • Twitter Backup, a browser based service to back up your Twitter accounts and tweets.
  • TwitPay, a nifty service that allows you to use PayPal and Twitter together to make payments to other Twitterers.
  • Twitpics lets you share photos on Twitter.
  • Remember the Milk lets you send to-dos and reminders to yourself via Twitter.
  • StrawPoll lets you create polls on Twitter.
  • TwtTrip lets you plan your next trip on Twitter.
  • Tweet What You Spend lets you track your cash and spending through Twitter.
  • TwitWall is a blogging companion for Twiiter which allows you to embed videos, mp3 files, podcasts, and photos.
  • TwtLong allows you to go beyond the 140 character limit and make longer posts.

Marketing and Promotion

  • Twitsu lets you schedule promotional tweets, run contests, and offer special deals.
  • TwtQpon lets you create and send coupons.
  • Twittertise allows you to advertise on Twitter and track the success of branded communications with your customers.
  • TwtBizCard lets you send a business card through Twitter.
  • Twellow a directory of public Twitter accounts, with hundreds of categories and search features to help you find people who matter to you.
  • twtQpon an online coupon creator that helps you to create and distribute coupons on Twitter, Facebook and other social media sites.

Searching & Finding

  • WeFollow lets you search for Twitters based on tags. You can also add yourself to WeFollow to help build your follower base.
  • Nearby Tweets instantly alerts you to Twitters who are in your geographic location.
  • Twibs lets you list and browse businesses on Twitter.
  • Mr. Tweet helps you find people and followers relevant to your interests.
  • Twitter Friends Browser is a visual mapping application that lets you see your followers.
  • TwitterVision is a graphical interface showing you, moment-by-moment, where the latest tweet is around the globe.
  • TwtVibe is an event manager tool that helps you organize tweetups and make meaningful connections through social media.
  • Twazzup search twitter. Get real insights.

Mobile

Other Social Media Integration

  • WordPress Plugin Twitter Tools is a plugin that creates a complete integration between your WordPress blog and your Twitter account.
  • TwitterFeed lets you feed your blog posts to your Twitter account.
  • Share/Bookmark