Patchy extends the Mantis bugtracking system to allow users to submit patches which are then autotested before being queued for approval. Please download, try the live demo (Home Page link above), join the announce mailing list for updates or help code!
A database driven, easy to use bug and issue tracking system with support for multiple users, user groups and projects. Themes, i18n, watchlists, internal messaging between developers and fully customization make it round.