Doom for SNES full source code released by former Sculptured Software employees
The complete source code for the Super Nintendo Entertainment System (SNES) version of Doom has been released on archive.org. Although some of the code was partially released a few years ago, this is the first time the full source code has been made publicly available.
Shaun James at GBAtemp
The code was very close to being lost forever, down to a corrupted disk that had to be fixed. It's crazy how much valuable, historically relevant code we're just letting rot away for no reason.