Scheme 9 from Empty Space is both a small Scheme implementation and a book describing the source code. I read 60% of the book this summer, and wasn't disappoint

Scheme 9 from Empty Space is both a small Scheme implementation and a book describing the source code. I read 60% of the book this summer, and wasn't disappointed. Written in portable C, it implements bignums, garbage collection, (nonhygienic) macros, hashed environments. http://www.bcl.hamilton.ie/~nmh/t3x.org/zzz/ http://www.bcl.hamilton.ie/~nmh/t3x.org/zzz/