SolveSpace just became "officially" available for the Web (
https://news.ycombinator.com/item?id=47586614), it is also officially supported on Windows (Vista-11), Linux and macOS.
However with a little effort it also compiles for and runs on Windows 2000. Here it is:
https://github.com/solvespace/solvespace/issues/1036#issueco...
So it runs on all the majour platforms from the last 26 years (excluding MacOS 9).
Im still bummed the web won the UI wars.