Brainfuck/Ook! Obfuscation/Encoding
This tool can run programs written in the Brainfuck and Ook! programming languages and display the output.
It can also take a plain text and obfuscate it as source code of a simple program of the above languages.
All the hard work (like actually understanding how those languages work) was done by Daniel Lorch and his Brainfuck interpreter in PHP
The source can be found at github.