Traq
Traq is a PHP and MySQL powered Project Tracker, you can easily track Milestones, Versions, Bugs, Feature Requests and see how far your project has come.
The project was founded by an Australian developer Jack Polgar.
This page, however, contains the
unofficial release of Traq 2.1.2 -- the only change from 2.1.1 is the availability of searching Tickets (or feature request, bug repost, etc); a basic functionality that was intentionally not included by the original author for whatever reason, I don't know.
So, here it is, download and overwrite your 2.1.1 installation. Quick disclaimer though: USE AT YOUR OWN RISK -- use
WinMerge to identify what was changed.