Doom 3 Source Code Is Now Free!

You've been patiently awaiting your crack at id Tech 4, the engine powering Doom 3, ever since id Software announced its intention to release the source code. Now, the wait is over! You can download it for yourself from GitHub right now.

edit: Looks like I can't post a comment. Anyways, it looks like it's just the code, the game data files are still propriety I believe.