TkGnats Home Page - Tcl/Tk-based front end for the GNU GNATS bug management system. While GNATS itself only runs on UNIX platforms, TkGnats runs on UNIX and Windows 95/NT (as of version 3.0.0). - http://www.timshel.ca/tkgnats/
The IT Problem Report Management System (PRMS) - The CERN modifications to Dan Kegel's wwwgnats include multiple domains, login in URL, all fields editable, moved state. - http://home.cern.ch/lovell/prms.html