I built a couple of desktop utilities with Godot, and they work fine on both Mac and Windows (I didn’t need to use them in Linux since they are mostly file grouping/management things). Pretty solid.

The one thing I don’t like about it is that you can’t really get the apps to look “native” in any shape or form, and that you have to roll your own widgets for a few things (which is why I went back to some of the wxWidgets stuff I have listed in https://taoofmac.com/space/dev/native)