Source : Free On-Line Dictionary of Computing

bug tracking system
     
         (BTS) A system for receiving and filing {bugs}
        reported against a {software} project, and tracking those bugs
        until they are fixed.  Most major software projects have their
        own BTS, the {source code} of which is often available for use
        by other projects.
     
        Well known BTSs include {GNATS}, {Bugzilla}, and {Debbugs}.
     
        (2002-06-12)