The Best Free and Open Source Data Mining Software
If I may plug the 140kit (<a href="http://140kit.com" rel="nofollow">http://140kit.com</a>) which is an open source Twitter mining and analytics solution that uses the streaming API to make downloading millions of Tweets in easily accessible formats quick and easy for anyone.<p>(doh, it looks like its down for some reason. Well, when it's back up- its there. I'm sure you could find the github repo and run it yourself since it is open source). Written in Rails.