"Bugzilla is a database for bugs. It lets people report bugs and
assigns these bugs to the appropriate developers. Developers can
use bugzilla to keep a to-do list as well as to prioritize,
schedule and track dependencies."
"Bugzilla also consists of an HTML front end to perform queries
into the database. Bugzilla's first installation was at mozilla.org
but since then several companies, private and public, open source
and commercial are using it to track software defects."