By the skin of my teeth, and JUST for the end of #marchintosh, I'm releasing libmui which is a Linux UI interface library heavily inspired by MacOS classic (and GS/OS!). https://github.com/buserror/libmui
GitHub - buserror/libmui: Classic MacOS & GS/OS widget library for linux (and other?)
Classic MacOS & GS/OS widget library for linux (and other?) - buserror/libmui
Michel
Rob Isaac