What is the best Scheme or LISP implementation for OS X?

Question

I am looking for a version of Scheme or even LISP that I can use to recover some lost Lisp development skills. Some web capabilities would be nice but not essential.

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Answer 1

I do recommend Racket to new-comers, since it provides one of the nicest IDE's for Scheme beginners (or rather, programming beginners who happen to be using Scheme, or better still, working their way through HtDP).

http://racket-lang.org/

Another option, for people who are more interested in a small Scheme system in order to modify it themselves or read its source code, is Larceny Scheme, which is of interest largely because its JIT compiler, Twobit, is itself implemented entirely in Scheme.

http://www.larcenists.org/

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Update: In addition, Chez Scheme has recently been open sourced:

https://github.com/cisco/ChezScheme

(It may not be as "small" as Larceny, but it has a very aggressive optimizing compiler.)