Welcome to Zozotez. Zozotez, which means Lisp in French, is a Lisp interpreter which runs under any BrainFuck environment. Zozotez is written in the name of science by Pål Wester to proove that it can be done in BF and to show off the power EBF provides. Zozotez is not meant to be a serious interpreter but it could be used to bootstrap serious work since it is easier creatig a BrainFuck interpreter/compiler than to create a LISP interpreter. The latest version of Zozotez can be downloaded from http://sylwester.no/zozotez/ . BrainFuck is an Esoteric language/turing tarpit that only has enough instructions to become Turing Complete which means that it is possible to create any application with it, but not as easy as some other programming languages. For more information on Brainfuck see http://en.wikipedia.org/wiki/Brainfuck . The idea of creating Lisp in Brainfuck started in 2007 when talking with a collague with my new found fasination and time waster: To create small brainfuck programs. Later that day we talked about favorite programming language and he's was Lisp. He said that the language is so easy to implement that it can be written in BrainFuck. The original LISP was based on research done by AI researcher John McCarthy in the late 1950's which produced a paper in 1958 describing the language which also included a interpreter written in itself using only 9 primitive operators that need to be implemented in some underlying machinecode. For a breif article on this see http://www.paulgraham.com/rootsoflisp.html which is slightly easier to understand than McCarthy's own paper which is more mathematical than programmer-oriented. In short, by implementing special forms quote, cond, label and lambda-functions and normal functions atom, eq, cons, car and cdr you have a turing complete programming language of a very high level with lots of power. By replacing label with set (for assigning values or lambda-expressions (functions) to symbols) you have more power than the first LISP and something usefull. By adding number support you need add, (additive) inv(erse), and one inequality operator of <,<=,> or >=. Zozotez shall not implement the first LISP, but a close decendant. I have no plans to extend it to conform to either Common Lisp or Scheme, but I guess by nature it will be closer to Scheme than Common Lisp. It will never be Scheme since it has dynamic scoping. How is it possible to create a programming language that can do recursion in a language that only has while loops? That was the question I asked myself some years ago and I came to the conclusion that IF you put each 'function' in a while loop and what function to run in a stack AND do not allow a program to use lower level code than the provided functions there is no limit other that memory to how much recursion you may do in BF. Zozotez has been on the drawing board since I started EBF and it will use lots of EBF-teqniques and data structures. For design thoughs and documentatiosn other than what provided in the binary zozotez.bf go to http://sylwester.no/zozotez/ Thank you for you interest in this project :) Happy hacking Pål "Sylwester" Wester