On a related note, does anyone know of a good (open source) golf simulator/game for Linux? Serious level gaming more than just entertainment, I'm thinking something like FlightGear of golf games.

I don't know any since I'm not playing any golf simulator games myself, but most games on Steam work in Linux with Proton so you might find something there. That's not open source of course but you had it in parenthesis which I think means this was optional :)