Wasm3 runs on Linux, Windows, macOS. If it doesn't work on other OSes like the BSDs, then it is not really 'cross-platform'.

It works on FreeBSD, at the end of the day: https://twitter.com/wasm3_engine/status/1253707153619247106

That ship has long since sailed. https://en.wikipedia.org/wiki/Cross-platform_software points out:

> a cross-platform application may run on Microsoft Windows, Linux, and macOS. Cross-platform programs may run on as many as all existing platforms, or on as few as two platforms.

A quick check of your own history shows you writing "Interesting to see another cross-platform GUI library here" at https://news.ycombinator.com/item?id=21903606 for Geeonx, whose web page only describes support for "Linux, macOS and Windows".