Planet rome.ro (thanks Daz) now offers the
release of the source code for the maps in the original Quake. Here's the
accompanying word from John Romero:
Since it's Quake 1's tenth
anniversary this year (starting June 22nd) I thought I'd dig up and release all
of Quake's original map sources. For all these years the only possible way to
glean any information from Quake's internal format was from BSP deconstruction
programs - but those had problems with tons of brushes generated from insane BSP
splits. So finally, here are the originals with the dust blown off of them,
shined-up and zipped up. Have fun, mappers!