Bugzilla is a free, full-featured bug tracking system designed to help manage software development. Bugzilla is licensed under the Mozilla Public License, and is thus both free and open source software.
Bugzilla allows individuals or groups of developers to keep track of bugs in their product effectively. Features include Generic Reporting, a Request System, Enterprise Group Support, User Wildcard Matching, Time Tracking, Multiple Authentication Methods, integrated email capabilites, editable user profiles etc.