FreeCAD and OpenSCAD. FreeCAD is steadily getting better and better.

I hate that there is not a good alternative to InDesign that works on linux.

If only the Affinity suit were to work on linux, even just with wine, I would be alright with the fact that it still is proprietary software. It was somehow able to replace my whole Ph/Ai/Id workflow but it is till keeping me from trying to switch to the penguin.