https://theforceengine.github.io The Force Engine is an open source reverse-engineered port of Dark Forces to modern systems, and it just hit 1.0, meaning it supports all features of the original game plus a ton of improvements. In addition to extending the life of a classic game (and its mods!) it's also a very interesting newcomer to the open source Doom-style 3D engines landscape - next on the roadmap is finishing the integrated tools and I'm very eager to see what people make with those.