== A Brainfuck Interpreter written in Erlang ==

Brainfuck is an esoteric programming language noted for its extreme minimalism. The language consists of only eight simple commands and an instruction pointer. It is designed to challenge and amuse programmers, and was not made to be suitable for practical use. It was created in 1993 by Urban Müller. (Source: Wikipedia)

This interpreter supports all eight instructions as well as nested loops. You can feed it a file with brainfuck code mixed with comments. It will execute the commands and ignore everything else.