I have released Monar 0.0.1 Scheme interpreter.
Monar is a free interpreter for R6RS Scheme.
Currently it covers a little of R6RS core scheme, utf-8 I/O,
quasiquote, apply , regexp , traditional macro,
30bit fixnum , simple port , simple CGI and format.
And Wiki works on Monar@FreeBSD+Apache.
http://monar.monaos.org/wiki/LambdaWiki
Downloads and More Information
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Source code and Monar documentation can be found on the web at:
http://code.google.com/p/monar/