An open source bug tracking system running on any web server allowing the execution of tdbengine binaries. It is distributed under the terms of the GPL.

A graphical bug reporting utility for GNOME. It allows users to easily make quality bug reports.

A free (GPL) bug tracking system for use with Microsoft IIS, Access and ASP.

Opensource web-based bug tracker written using ASP.NET and C#.

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.

A tool for metric evaluation for Bugzilla databases. Its main characteristics are the specification of metrics by the users, separation between these specifications and data retrieval, an event driven algorithm and an abstraction of data sources.

GPL'd Perl-5 scripts which maintain a database of problem reports. Input by email, listings via webserver.

Open source, web based bug tracking system written with a focus on ease-of-use.

Web based bug tracking system running on Windows, Linux, Unix as a CGI for Apache or other web server.

Open source web-based bug tracking system written on PHP, provides features such as custom templates, advanced filters, LDAP support, email notifications and graphical project metrics.