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.
Open source issue tracking and project issue management solution built using the ASP.NET web application framework. Features e-mail notifications, reporting and per project configuration of fields and values.
Opensource web-based bug tracker written using ASP.NET and C#.
Open source PHP-MySQL bug tracking system that has customizable CSS/XHTML templates, e-mail notifications, Atom syndication and internationalization support.
A free (GPL) bug tracking system for use with Microsoft IIS, Access and ASP.
Debian Bug Tracking Software
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.
RT: Request Tracker
A free web and email-based bug tracking and trouble ticketing system. Features list, documentation screen shots, and download.
A simple-to-use and -install issue-tracking system with command-line, web and e-mail interfaces.
Free web-based bug tracking, ticketing and project resource tracking system. Designed to meet the requirements of most Information Technology, Consulting and Engineering projects.
Web-based software project management and bug/issue tracking system. Provides an interface to Subversion and an integrated wiki.
VSBT: Very Simple Bug Tracking
A simple bug tracking system designed for individual developers or small groups, released under the GNU General Public License.
A web-based bug tracking system built in PHP.