TwitterMass
TwitterMass is a Twitter application that helps you grow your Twitter follower base. TwitterMass allows you to auto/manual follow users based on certain keywords. It also provides metrics for keywords that you are searching for as well as followers gained due to auto-follow rules.
As described by the authors,
TwitterMass is a hyper networking tool for Twitter on steroids. It fully automates the process of growing your Twitter network by following people based on a keyword universe you create.

Traffic rankings are sourced from multiple sources, if available, for the Twitter application. This includes Alexa, and Compete rankings.
April 7th, 2009 at 4:24 PM
Hi Anuj! Thank you for choosing to write about TwitterMass on Twitdom. I sincerely appreciate it.
May 29th, 2009 at 3:10 PM
Downloading mine now! Thanks Anuj!