I am looking for a mature and maintained Scheme compiler that can produce stand-alone, native-code executables on (each of) Windows (.exe), Mac OS X, and Linux. No GUI is needed for the executables - just standard text IO (stdin/stdout/stderr) is fine. What compiler would you recommend satisfies these requirements?
An answer to a related (but different) question suggests Gambit-C. According to the commit log it still seems active. Is there any other competitor? MIT Scheme does not seem to be updated often - am I correct?
Thanks!
P.S. To answer a comment: for me, any version of Scheme since R4RS is fine, but rich SRFI support may be more important.
Another comment suggested CHICKEN, which also seems active. It also suggested Racket, which is a byte-code compiler but has JIT and can create a standalone package. (I haven't yet checked Chez Scheme. I am "copying" these "answers" here since the question is put on hold and cannot seem to be reopened even after being edited as instructed...)