John Carmack announced during his keynote speech at this year's QuakeCon that the game Wolfenstein: Enemy Territory has now gone open source for those with dab hands for modding of such titles.
Although an official press release has yet to be issued this should stand as exciting news for Wolfenstein fans and those who have the skills and dedication to come up with some interesting mods (the minds of fans can bring together some very unique ideas though modding if past experience serves well).
You can grab the source code from the mirrors at the link
. Happy modding!