Scheme 9 from Empty Space (new edition)
t3x.org
t3x.org
http://www.t3x.org/s9fes/index.html
Only problem is, you have to navigate your way through a maze to get to the actual code from there.
I wrote a quick hacked-up web crawler (in emacs lisp, of all things!) to solve it because I was too impatient to do it for real.
Scheme 9 from Empty Space -- A Comprehensible Scheme Interpreter By Nils M Holm, 2007-2010
* Do whatever you want with this code. * If the code doesn't work, don't blame me.
I'm going to wrap it in a Perl module so the whole thing comes right down from CPAN, just like SQLite. This is exactly what I've been waiting for, for years.