(Author here) This is an offshoot of a codebase that is used as an internal (and soon to be external) development tool.

It's a hit around the office and makes light fun of our real product.

It's build on Node.js, and in particular uses a nice SAX parser (https://github.com/tautologistics/node-htmlparser/) to handle the page transformation.

Also, http://www.catapi.com provides the cat images.