Download Defect Tracking Tools:

1) Mantis

2) BugGenie

3) Bugzilla   (Download link for Bugzilla)

4) Virtual BugZilla (Download Virtual BugZilla version 3.4 with Built in VMWare ready to use file for Windows platform from here)

5) WebBug Tracker

6) PR Tracker

7) Track Studio

8) Advanced Defect Trackng

9) Track Plus

10) QuickBugs

11) Census