I’ve just open-sourced my 3D space combat sim called Ares: Dogfighter. Everything is at https://bitbucket.org/SteveSmith16384/aresdogfighteros , including code and assets.
I originally started it with the intention of creating an Elite clone. As it currently stands, you can fly a ship around, dogfight with enemies, avoid meteors, fly past planets. Since I’ve not nailed down the exact game, there’s lots of code that’s quite useful but not currently used.
Here’s a recent vid showing what’s there already:-
I hope someone finds it useful.