Agstools - BugTrack, simple free bugtracking system based on perl5 and any DBI compliant database.
Bug-A-Boo - An open source bug tracking system running on any web server allowing the execution of tdbengine binaries. It is dristributed unter the terms of the GPL.
Bug-Buddy - A graphical bug reporting utility for GNOME. It allows users to easily make quality bug reports.
Bugs Online - A free (GPL) bug tracking system for use with Microsoft IIS, Access and ASP.
BugTracker.NET - Opensource web-based bug tracker written using ASP.NET and C#.
Bugzilla - 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.
Debian Bug Tracking Software - GPL'd Perl-5 scripts which maintain a database of problem reports. Input by email, listings via webserver.
GIFFT - Web based bug tracking system running on Windows, Linux, Unix as a CGI for Apache or other web server.
IssueTrackerProduct - Open-source web-based issue/bug tracker, written in Python.
JitterBug - 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 required.
Keystone - 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.
Mantis - php/MySQL/web based bugtracking system.
phpBugTracker - A web-based bug tracking system built in PHP.
Roundup - A simple-to-use and -install issue-tracking system with command-line, web and e-mail interfaces.
RT: Request Tracker - A free web and email-based bug tracking and trouble ticketing system. Features list, documentation screen shots, and download.
Teamatic - Free web-based bug tracking, ticketing and project resource tracking system. Designed to meet the requirements of most Information Technology, Consulting and Engineering projects.
Trac - Web-based software project management and bug/issue tracking system. Provides an interface to Subversion and an integrated wiki.
WREQ - Work Request, a distributed request/problem tracking system, written in Perl 5. Access by Web or email.
