Freedoom Versions/Archive (Kinda All)

The Freedoom project aims to provide all the content needed to form a complete, entirely free/libre game for the Doom engine. It is designed to be compatible with most custom levels, music, graphics and other modifications (“mods”) made for the original Doom games by Doom fans and artists over the decades.

Official Page Freedoom - https://freedoom.github.io/index.html
Freedoom 0.1 Release - 16 april 2003
Github Freedoom - https://github.com/freedoom/freedoom