Name:Twitonomy (Free)
URL:http://twitonomy.com/
Utility:This free tool - 

• Provides detailed and visual analytics on anyone’s tweets,  retweets, replies, mentions, hashtags etc 
• Enables browse, search, filter and get insights on the people you follow and those who follow you
• Backup/ export tweets, retweets, mentions and reports to Excel and PDF in just one click 
• Monitors the interactions with other Twitter users: mentions, retweets, favourites 
• Monitor tweets from the favourite users, lists and keyword searches 
• Find auctionable insights on the followers with Followers report 
• Find out those you follow but don’t follow you back 
• Download follower and following list to Excel 
• Browse, sort and add/ remove people to your lists 
• Get the list of followers you don’t follow back 
• Track clicks on the links in your tweets 
• Track the followers growth over time 

Special Features:

• Enables export Search Analytics on any keywords, #hashtags, URL or @users
• Enables download any user’s re-twitted and favourite tweet