CVSTrac's home [http://www.cvstrac.org/] 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 
[http://cvs.hwaci.com/tktoolkit/timeline] is the live timeline for 
[tktoolkit], which illustrates [[explain]].

CVSTrac builds in a convenient [Wiki].  Its reporting facility permits 
arbitrary [SQL] queries.  It "tickets" [[explain]] conveniently.