SDooM

This is a Source port of the Original Doom into S&Box.
It comes packaged with the Shareware copy of Doom.
Thanks to:
Doom Loader for Unity https://www.doomworld.com/forum/topic/98682-doomloader-for-unity/ This helped me get past the Sector Triangulation Problem.
Doom Wiki https://doomwiki.org/
ZDoom Wiki https://zdoom.org/wiki
These sites were invaluable for knowing how Doom operates under the hood.
Cyotek https://www.cyotek.com/blog/reading-doom-wad-files For getting me started
The Facepunch team, Especially ogniK Who helped me understand Shaders and SoundStreams
Managed Doom & MeltySynth https://github.com/sinshu/managed-doom https://github.com/sinshu/meltysynth For helping me understrand and parse Mus files