Twitonomy is a web application that allows you to analyze a Twitter account, through different methods.
This service allows you to generate detailed visual analytics and tweets, retweets, replies, mentions and hashtags. You can also search and filter data of people who follow us and those who we follow.
Another important feature of this service is that we can monitor our interactions with our friends, from references, up to favorites.
It offers us the list of our followers to which we do not follow and also allows us to manage our lists. What we mentioned so far are just some features of all it offers.
Still in beta and only need to use it to connect to Twitter and authorize the service.