CVSTrac's home [L1 ] advertises it as "A Web-Based Bug And Patch-Set Tracking System For CVS". To developers, it offers SCM functionality, layered over CVS. It's roughly comparable to Bonsai. It improves on CVS with the key abstraction of "change sets" or "patch-sets".
Key to effective use of CVSTrac is its "timeline" [explain]. This [L2 ] is the live timeline for tktoolkit, which illustrates [explain]. DRH writes, "When you have multiple people working on a project, the timeline is invaluable for keeping up with what others are doing. . . . Timeline-like stuff is very important to CMM nazis."
CVSTrac builds in a convenient Wiki. Its reporting facility permits arbitrary SQL queries. It "tickets" [explain] conveniently.