If you’re a Twitter power user, chances are good you know how to work your stream to bring the most valuable information and resources to your followers.  You also pride yourself on your ability to not only hold interesting conversations but actually make the conversation relevant to others.  However, you also may have found yourself frustrated with friend and follower management or other challenges that come with managing a successful Twitter profile.
Here are some free tools to make tracking unfollowers and followers a little easier!
Handling Unfollowers
Concerned about losing high-Klout followers?  Tired of Tweeps unfollowing you as soon as you follow them?  These tools help you keep track of when you lose followers and identifies them for you, so you can decide if you want to try to woo them back or unfollow them in vicious retribution.
http://twunfollow.com:  [FREE]  This tool’s so handy!  TwUnfollow notifies you via email about Twitter followers that are not following you any longer. It checks followers about four to five times a day.
http://useqwitter.com:  [FREE & Premium Fee, Annual $4.99] UseQwitter sends you a summary email at least once a day informing you of those who have stopped following you on Twitter and helps you identify Twitter spammers and spam bots.
Tweepi:  [FREE, Premium account coming soon] Allows you to bulk follow/unfollow and quickly unfollow those who do not reciprocate.  Clean up your Twitter account from spammers and deadbeat users, as well as make sure you follow tweeps who deserve to be followed.
Tweet Power!
Are you tweeting interesting, useful information or uninteresting drivel?  These services help you track the effect your tweets have on your followers:
http://tweeteffect.com: [FREE]  Find out which of your Twitter updates made people follow or leave you.  Simply enter your Twitter ID to find out! I find this generally accurate but sometimes the numbers seem a tad off.  Good attention and recordkeeping will inform you of the tool’s accuracy.
Topsy Trackbacks Bookmarklet:  [FREE, link updated]  This one is a tool I have in heavy rotation. You can see who’s tweeting any page on the web, great for tracking your own promos, site and blog updates, contests, etc.
Comprehensive Tracking of Friends and Followers
http://friendorfollow.com:  [FREE] Who’s not following you back on Twitter? Who are you not following back? Who are your mutual friends? Find out! This is especially handy if you know people more by their avatars than their names.  Makes it simple to track down people you follow who have been remiss about following you back. You can also sort by those who have protected theiur tweets and Verified accounts.  This service also allows CSV downloads, making organization a breeze.
http://mytweeple.com:  [FREE] Very, very handy and has option to display Klout of each tweep.  The .csv export function pretty much rules.   My Tweeple is a great way to manage all of your Twitter people in one place. You can easily see who you’re following and who’s following you. With a simple click, you can follow, unfollow, or block people, and these changes instantly update Twitter.
Communication and Time Management
The dashboards below not only make profile and conversation management a breeze, you can also schedule tweets in advance, automatically shorten URLs with your choice of standard, non-spam URL shorteners and much more.
Hootsuite:  [FREE & Paid accounts at $5.99 mo]  Social Media Dashboard. You can monitor keywords, manage multiple Twitter, Facebook, LinkedIn, Foursquare, Ping.fm and WordPress profiles, schedule messages, and measure your value and success with substantive data. Both free and paid services.
Tweetdeck:   [FREE]  An Adobe AIR desktop application and social media dashboard for Twitter, Facebook, LinkedIn, Google Buzz, Foursquare, and MySpace. Like other Twitter applications it interfaces with the Twitter API to allow users to send and receive tweets and view profiles.
Follow Friday Helper: [FREE]  This site makes it easy to recommend tweeps via Follow Fridays on Twitter. FFH shows you a filtered list of users you interact with on Twitter. You can then write more personal #TY, #FF, #FollowFriday (etc) tweets using the user’s name, URL, bio and location with just a few clicks.  Filter tweeps by retweets, mentions and more!
SocialOomph: [FREE & Paid accounts, $29.97 mo]  Boost your social media productivity with this robust service. Provides services that include scheduling updates for Twitter, automating certain follower management tasks, purging your Twitter DM inbox, receiving email digests of tweets that contain keywords that you specify, getting an integrated view of your mentions and retweets across many accounts.
twAitter: [FREE]  Incredible resources for free!  Takes scheduling tweets to the next level by offering tweet repeats and rotation for free, which SocialOomph charges for in their paid account. twAitter will soon be renamed Gremln; the ability to schedule, rotate and repeat your tweets will remain unchanged.
Formulists: [FREE, for now] Organize groups of people on Twitter into smart, auto-updating Twitter lists.  Filter and network with people based on location, bio keywords, twitter activity, number of followers and more.
Evaluating the Value and Influence of Your Twitter Profile and much more.
Klout.com:  [FREE]
If you’re

1. A total SEO geek and understand how PageRank works and want the same for your Twitter account or
2. A micromanaging freak who wants to tweak their Twitter profile into a powerhouse of interest and value or
3. Interested in knowing exactly how influential someone is on Twitter BEFORE you follow them.

Klout is essentially like PageRank for your Twitter profile and is the measurement of your overall online influence.  And, unlike like PageRank, Klout actually counts for something.
What is the best Twitter tool out there? Yourself! Keep your tweets compelling, interesting and useful, and you’ll be on your way to attracting awesome followers and building real, useful relationships on Twitter!