I've used Dr Scheme with arc (technically anarki-arc). It worked with no problem on Windows XP / Windows Vista / Ubuntu / Mac OS X (10.5). It's probably the single easiest way to demo it to someone that isn't familiar with lisp/scheme. (java heads, .net programmers, etc.)

Demoing it with a eclipse / visual studio like IDE really does make a difference. There a a surprising number of people who dislike VI/VIM and emacs.

When I'm actually doing arc development I use emacs and inferior-arc.

http://github.com/nex3/arc/tree/master/extras/inferior-arc.e...