Bugzilla - http://www.bugzilla.org/ Bug tracking used by the Mozilla projects. Inherently web-based, written in Perl, and uses MySQL as its database back-end. Open-Source. Updates available via CVS. Trac - http://trac.edgewall.org/ Trac is a web-based software project management and bug/issue tracking system. It provides an interface to Subversion and an integrated wiki.