Star Wars Jedi Knight I and II: Jedi Academy and Jedi Outcast (Not stable) - OpenJK github.com/JACoders/OpenJK

Despite the official name being “Jedi Knight: Jedi Academy” it is not Jedi Knight I. It is actually a sequel to Jedi Knight II: Jedi Outcast. It came out only a year after JO and was announced in April. At first I thought it was an April Fool’s joke because the screenshots looked like something that could easily be made with the mod tools at the time.

Anyways, the real Jedi Knight I was “Jedi Knight: Dark Forces II”. An open source implementation is available at github.com/shinyquagsire23/OpenJKDF2

And to round it off, the open source implementation of Dark Forces is available at theforceengine.github.io. I think it even supports the remaster.