Based on the actual drawing process and brushes available, this looks like it's based heavily on this work from "Mr. Doob", which I use quite frequently. http:

Based on the actual drawing process and brushes available, this looks like it's based heavily on this work from "Mr. Doob", which I use quite frequently. http://mrdoob.com/projects/harmony/ http://mrdoob.com/projects/harmony/ Update: They do give credit in the ABOUT on the page/extension, happy to see that. :) I like that they've added an undo, but I wish it was unlimited. 1 undo just isn't enough. This is a seriously cool drawing app to play with though.