It's actually distributed as a Node app built using
socket.io, connect, and watch. The UI currently takes a little bit of getting used to, but it worked well enough for me to make a few
little experiments without reading any documentation.
The post discusses some of the algorithms used to create the erosion
effects, and there's an awesome demo called
Craftscape (GitHub: pyalot / craftscape) which has been
featured as a Chrome
There's now a formidable array of mobile web frameworks for those
looking to create mobile web experiences that look close to native apps.
One I haven't mentioned before on DailyJS is DHTMLX
Touch (License: GPL), which has just
seen its 1.0 release. It features lots of UI widgets, and a suite of
developer tools including a skin
builder and IDE integration.