I’ve used Freecad for a few projects. It’s definitely usable, but the learning curve is really steep, even for someone who already knows other CAD. I don’t think the workflow/features are there yet for being able to use it professionally in most cases. It feels much more like an engineering tool than an industrial design tool, which is part of why I hold that opinion.

I have not used Librecad. It’s 2D, right?

I get better game performance in Linux, but I still use Windows mostly due to CAD software (just like you’re saying). I hope those companies see the value in developing for Linux, but I’m not sure the statistics are there to convince them yet. Chicken/egg problem?

Good recommendation, thanks. Another game on fdroid that’s worth trying is Mindustry, but it’s a totally different kind of game.