Some time in 1999, John Carmack decided to release the Doom source under the GPL. This page outlines the great master plan for the packages and integration necessary for a complete Doom experience in Debian.
These guidelines need development and possibly turning into a package themselves. Whether the content should be policy is a matter of debate.
So what is needed for a "complete Doom experience"? Categories in bold, concrete examples follow.
node builder (related to level editing)
- bsp: was ITPd, closed in favour of GLBSP
- glbsp: built, not a team package, awaiting sponsor
- none yet (I think Yagisan maintains some externally)