Gerbil Scheme
This looks like a fun Scheme to play with at some point.
I'm not 100% sure the content of this page is totally correct; it would be interesting to work through it and be sure. Interesting idea though.
Also... Turbo Pascal! <3
A guide to building an interpreter for your own language.
One day.... one day.
It's a Forth. It's a Lisp. It's lambda calculus. It looks like fun and also something I'd never actually really use.