John Carmack twittered that it's finally in the hands of aspiring developers who want it. Apparently some of the code was rewritten because it made the legal suits nervous. Github has it.
The code in question was "about the patent issue around "Carmack's reverse", said Carmack. You can nab the source files online . It's good to see studios help others
Doom 3 source code now available from id Software
23 November 2011 | By Simon Priest