Activision & Raven Open-Source Two Games
In case someone is interested in having a look. Dunno if they have
released something compilable or not, if they released or not the game
data, but I thought that it might be interesting enough to mention it
The Activision and Raven Software game studios have open-sourced two
of their games for "for people to learn from and play with" the code.
The source code to the games Star Wars Jedi Knight 2: Jedi Outcast and
Jedi Academy are now open-source and hosted on SourceForge.
Star Wars Jedi Knight 2: Jedi Outcast is a 2002 title that features
single player and multi-player modes for the Star Wars themed
third-person action game. The game is powered by the Quake III: Team
Arena engine with customizations done by Raven Software.
Star Wars Jedi Knight: Jedi Academy is a third-person shooter game
from 2003 that is also powered by the Quake III engine.
The source-code to these two Star Wars games from the last decade have
been opened up under the GPLv2. The code is available on SourceForge
via jedioutcast  and jediacademy . The open-sourcing of these
games happened on Wednesday and coincidentally, Disney on the same day
shutdown LucasArts that was involved with these two Star Wars games.
( http://www.phoronix.com/scan.php?page=news_item&px=MTM0MzA )