Fabric.js: JavaScript Canvas Library

Script Junkie | Introduction to Fabric.js: Part 1 @ MSDN

"Fabric.js—a powerful JavaScript library that makes working with the HTML5 canvas element a breeze. Fabric provides a missing object model for canvas, as well as an SVG parser, a layer of interactivity, and a whole suite of other indispensable tools. It is a fully open-source project, licensed under MIT, with many contributions over the years."

Part 2

Part 3

Part 4