Hello!
Here is my own simple lisp interpreter, called MLISP (Math LISP):
Code:
http://pages.plotinka.ru/~agre/mlisp.html
It's very simple and can introduce you to main lisp features (I hope).
Installation: $ make install
Documentation:$ man mlisp
Feel free to ask me through email (see mlisp -v).
Hope, this will be useful.