Bugzilla is the leading open-source/free software bug tracking system, with high-profile installations at mozilla.org, GNOME, Red Hat, and NASA, among others. It features a comprehensive set of fields, attachment management, inter-bug dependencies, email notification of changes, a powerful query interface, reporting, and Web, XML, email, and console interfaces. It can be managed entirely using a Web-based UI. The user UI is customizable using templates.
License: Mozilla Public License (MPL)
Changes:
This is the latest stable version, containing several useful bugfixes over 3.0.3, particularly for the inbound email interface. It also has two security fixes.