The easiest, most intuitive torrent tracker in the world.
A project of Downhill Battle.
Feb 18: Version 0.9 Released
-Supports Mac OS X for download and upload
-Elegant, optional support for MySQL
From the readme.txt:
Blog Torrent is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.