Wikipedia
Debbugs
Debbugs is the software powering the Debian project's issue tracking system. A unique aspect is that it doesn't have any form of web-interface to edit bug reports - all modification is done through email. Debbugs was mainly written by Ian Jackson, former Debian project leader.
Debbugs consists of a set of scripts which maintain a database of problem reports. The scripts have been parameterised so that they can be used for other projects besides Debian. The system runs on Unix-like operating systems such as Unix and Linux. Most of the source code is written in Perl. It is free software, licensed under the GNU General Public License.
It is strongly recommended that people use the reportbug program, when reporting bugs in Debian.