In case you didn’t know, you’ve been able to pick up the original DOOM for the iPhone for awhile now ($6.99 on iTunes).
If that seems too simple, however, you can now download the DOOM iPhone source code, as iD Software has just released it to the masses on their DOOM Classic website. They’ve even included build instructions to compile the code on a Mac OS X system.
Oh, John Carmack. You’re such a pal.
Source: Blue’s News