Whitespace is an esoteric imperative stack-based language made by two guys who had too much time on their hands.
This is an implementation of the language in javascript.
All the programs in ws should work fine.
You can simply run it with:
$ node index.js file.ws
Or you can see the compiled bytecode:
$ node index.js debug file.ws
For more information and the reference implementation, see the official website.