Mantis is an issue tracker implemented in PHP and using MySQL as a database. The features of mantis include: * Web based access * Simple/advanced issue pages * Multiple projects per instance * Support for projects, sub-projects, and categories * Users can have different access level per project * Changelog support * Roadmap * My View page * Search and filter * Built-in reporting (reports/graphs) * Timetracking * Custom fields * E-mail notifications * Users can monitor specific issues * RSS feeds * and more