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.
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).
Web resources about GNATS, the GNU Bug Tracking Sy
Dan Kegel's unofficial Web page is pretty comprehensive.