Although it has little recent activity and could be bitrotted to uselessness, there is a standalone acme package for various other systems:
I think one reason Acme never really took off was the same reason people go around using xterms with green text on a black background--sure, it's not especially easy to read, but by god it is haxxor l33t. Acme has about two keyboard combo commands (^a and ^e, to go to the start or end of a line) and expects you to select text, move frames, and set the insertion point with the mouse, and the mouse is definitely Not Cool, even if it means you have to hammer on C-n, C-p, C-f, C-b to get that cursor where you want it.