Bugzilla is a bug tracking system that was constructed to handle issues raised against the Mozilla project. Originally written in Tcl it was ported to Perl by Netscape engineers. Bugzilla uses a MySQL database to hold the bug data and is accessed through CGI scripts written in Perl. Bugzilla is rapidly becoming the most widely used bug-tracking system for open source projects. Notable installations include RedHat, ActiveState, OpenOffice and of course the Mozilla project. The most recent versions of bugzilla provide a templating mechanism to permit sites to customize the HTML output without having to hack the perl source quite so much. [PT]
See also SCM.