GNATS is a bug-tracking tool designed for use at a central support
site. Software users who experience problems use electronic mail to
communicate these problems to the the maintainers of that software.
GNATS partially automates the tracking of these problems by:

* Organizing problem reports into a database and notifying
responsible parties of suspected bugs

* Allowing support personnel and their managers to edit, query, and
report on accumulated bugs

* Providing a reliable archive of problems with a given program and
a history of the life of the program by preserving its reported
problems and their subsequent solutions

GNATS offers many of the same features offered by more generic
databases. You can query and edit existing problem reports (PRs) as
well as obtain reports on groups of PRs. The database itself is simply
an ordered repository for problem reports. Each PR receives a unique,
incremental PR number, which identifies it throughout its lifetime.