For any oldies that enjoyed the original Dark Forces game below, an interesting project is on the go to reverse engineer the original game engine.

Something I didn't realise was that this game was not a Doom clone, I always thought back in the day it was using the Doom engine. However, turns out it was an engine simply called Jedi, used on two games, Dark Forces & Outlaws. I'll be honest the latter doesn't look that great even as a retro.
It will be brilliant if the guy doing this new engine pulls it off and gives the game a new lease of life.
The project seems mildly active, there are a couple of recent forum posts of progress in August.

I think one reason I thought the game engine was Doom, is the similarity of the sound used when picking up objects.
But the sound effects and music still hold up today.