1)   BC BugTracker 4.1.1
BC BugTracker is a web enabled Bug Tracking and Quality Control System for SMEs and fortune 1000 companies. Source Code Available.

 2)   IMS 1.0
IMS is a bug-tracking system. The main advantages of the system are: carefully designed set of basic functions, security features, extensible and adaptable report generation system, professional-looking Web-based user interface.