https://archive.org/details/gamesourcecode
This is a collection of computer game source code. The majority of these titles were originally released as commercial products and the source code was made available to the public at a later time.
Developers have released these assets under varying licenses. Information about the license restrictions is included when known.
If you are the copyright holder of a computer game and would like to make your source code available here please e-mail me at swizzle@demu.org. Or if you know of a game which has had it’s source code released which is not present in our archive.