These are only a few of the available tools for managing and analyzing your Twitter account performance. Be sure to shop around to find the right tools for you.
Twitter Grader: Analyzes multiple factors and tells you things you might need to work on. Gives you a grade on your performance.
Klout: Analyzes multiple factors and gives more detailed explanations of the results than Twitter Grader, although you have to register to get some of these results. It also grades harder than Twitter Grader.
Tweepi: Excellent tool for follower management (following and unfollowing multiple people at a time) and for finding people to follow. Many other apps let you find people, but none make it so easy to follow several at a time and without leaving the site.
Tweetreach: Analyzes the reach of your tweets (how many people see them).
SocialOomph: Simple tool for scheduling tweets in advance and more. The scheduling approach helps you avoid overtweeting and also helps with time management.
CoTweet: A robust tool for managing multiple accounts with ability to monitor keywords and trends. Other features include click tracking with bit.ly, scheduling, and posting one tweet across multiple accounts. Designed for teams but fine for individuals with one or more accounts who need scheduling feature. Free (for the moment).
Addict-o-matic: Track what is being said about your Twitter account or keyword across the web.
RetweetRank: See your percentile and absolute ranking based on the percent of your tweets that are retweeted, an important analytic that will give you some idea of whether your tweets are providing value to your followers.
Tweetchat: A space where you can hold a chat on a certain topic for your followers to join, and participate in or follow others’ chats using hashtags.
Follow Cost: Asks the question “How annoying will it be to follow [twittername] on Twitter?” Put your own name in there. If the answer is “nuclear follow cost,” you’re an overtweeter. Rethink your strategy; you’re making too much noise.
For more info on Twitter, see Twitter: how does it work?