If you're interested in using this yourself or just frustrated that you can't see it, check out the library that it's built with, Blockly. It's a really neat way to introduce people to programming, and you can also use it for "real" applications. At my previous job we talked about (but never implemented) a business workflow application using it.<p><a href="https://code.google.com/p/blockly/" rel="nofollow">https://code.google.com/p/blockly/</a>