I agree AROS is very much like AmigaOS 3.x and runs on multiplatforms including old Amiga 68K systems. It even has a Kickstart replacement ROM that is legal to use in Amiga emulators.

HaikuOS aims at BEOS compatibility and also works nicely.

ReactOS I've donated to them so they could reach their 4.x milestone.

If I was some rich billionare or a CEO I'd donate a million dollars to each alternative project.

Interesting, I only recently started watching a few YouTubers regarding Amiga stuff, wasn't even aware that AROS existed.

Thanks for correcting me, looks like a pretty cool project will have to look more into it.

Link for anyone else wondering: https://en.wikipedia.org/wiki/AROS_Research_Operating_System

It even runs on original Amiga hardware as well as on emulators and on PCs.