Recently appearing is a new open source game engine project called The Force Engine, with an aim to be an accurate version of the Jedi Engine that powered games like Dark Forces and Outlaws.
There were other attempts like DarkXL / XL Engine, which the author sadly stopped some time ago. The developer of The Force Engine mentions that while it "shares a legacy with DarkXL, it is a complete rewrite" as written on the official site. Quite an exciting project if they keep up with it especially with it having modern, built-in tools, such as a level editor and support for mods that were designed to work with the original games.
Currently the developer is hoping to have a first proper release out in November 2020, with that having Dark Forces in a completable state (although "Beta") and Outlaws as a "tech demo". Their roadmap is clear that Linux support is an aim for this November release too!
I'm sure I sound like a broken record but I really do love open source for projects like this. There's many great game engine remakes out there like OpenMW, OpenRA, openXcom and more. Hope to see The Force Engine up there with them eventually.