https://github.com/2point21/lba1-classic

https://github.com/2point21/lba2-classic

I learned about this via /v/ but also saw an old thread on r/games

Technically the engines are open source now, and not the games, but still great news! This should enable source ports and engine updates, as well as new games that use that engine (games that use Doom's engine know best).