Debian GNU/Linux
From 23C3 Public Wiki
Debian GNU/Linux is a free operating system, developed by more than a thousand volunteers from all over the world who collaborate via the Internet. Debian's dedication to Free Software, its non-profit nature, and its open development model make it unique among GNU/Linux distributions.
The Debian project's key strengths are its volunteer base, its dedication to the Debian Social Contract, and its commitment to provide the best operating system possible.
At the 23C3 we plan to gather somewhere, have a booth like table, with some information material, probably a machine continuely installing Debian, looping through all supportted languages (60 or so) and answer questions like "why was etch not released on december 4th?" or "when will etch release?";)
Of course we will also do some hacking and bug fixing there as well as answer your questions, e.g. how to contribute to Debian.