redmine-lite A lightweight, easy-to-install fork of Redmine 1.0.3-stable. Mike Leone Panoptic Development, Inc 23 Mar 2011
What's redmine? Open source, web-based issue- and task-tracking software
Built on Rails.
http://www.redmine.org/
Recently, some of the redmine dev team forked it to create ChiliProject.
https://www.chiliproject.org/
I haven't looked into ChiliProject yet.

redmine-lite