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

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.