Flyspray is an uncomplicated, web-based bug tracking system written in PHP
for assisting with software development.

Features include:

    * Web-based, platform-independent
    * Multiple database support, currently MySQL and PGSQL
    * Easy installation
    * Easy to use
    * Multiple projects
    * 'Watching' tasks, with notification of changes (email or Jabber)
    * Comprehensive task history
    * File attachments
    * CSS themes
    * Advanced search features (though easy to use)
    * Atom/RSS feeds
    * Two syntax options for task descriptions and more (Dokuwiki / plain text)
    * Voting for tasks
    * Dependency graphs

WWW: http://www.flyspray.org/