-ask
You can download Oberon as a user-space program
running on lots of systems (search google).
If you use it for only a little while you'll
see a lot of where Acme came from.
I tried this a few months ago and was
really frustrated by the interface. It was simultaneously
so close to and subtly different from Acme that I never
really got the hang of it. (Of course, that's not
necessarily Oberon's fault; if I'd learned Oberon first
maybe Acme would be infuriating.)