A simple bug tracking system designed for individual developers or small groups, released under the GNU General Public License.

Free web-based bug tracking, ticketing and project resource tracking system. Designed to meet the requirements of most Information Technology, Consulting and Engineering projects.

A free web and email-based bug tracking and trouble ticketing system. Features list, documentation screen shots, and download.

A web-based bug tracking system built in PHP.

Data stored in a SQL database, accessed by any Web browser which understands forms, tables, and cookies. By StoneKeep consulting. Free for under 10 users.

A web based bug tracking system, originally developed by the Samba Team to handle bug tracking, problem reports and queries, now available under the GNU General Public License. Operates like a communal Web based email system - no database back end req...

Open-source web-based issue/bug tracker, written in Python.

Work Request, a distributed request/problem tracking system, written in Perl 5. Access by Web or email.

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.

Open source PHP-MySQL bug tracking system that has customizable CSS/XHTML templates, e-mail notifications, Atom syndication and internationalization support.