A Piet to Javascript JIT compiler. Because why not?
While something of a work in progress, it can currently quite happily run the demo programs for npiet.
To run via node, first install dependencies, then: $ coffee cli.coffee program.ppm
Alternatively jspiet can be used in the browser. Install jquery and underscore.js to lib, then: $ coffee -cb *.coffee
Note that the generated .js files will have to be removed if you want to use node again. I should probably package this properly to avoid this.