You have several options for single-client Lisp environments.
If you prefer an Emacs-based environment, check out the LispBox . This actually installs a separate instance of Emacs, afaik, so you probably won't have existing Emacs settings.
If you want to use existing Emacs, SLIME is available either through quicklisp (which you really should use) or through ELPA .
If you're fine with the lack of an Emacs environment, and you won't be using that language for a long time, take a look at LispWorks personal , which has a one-click environment installer in OS X.
If you really asked about a Scheme (or could go either for a Schema or for Common Lisp), look at Racket (and not technically a scheme, in fact it has a lot of additional functions, but they support R5RS and have a rather short short list of unsupported R6RS functions ),
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