Fabric also has SVG-to-canvas (and canvas-to-SVG) parser.
Multirange is a tiny polyfill for HTML5 multi-handle sliders.
Plyr is a simple, accessible and customizable HTML5, YouTube and Vimeo media player.
jQuery Video Extend is a plugin to extend HTML5 videos as:
A tutorial about creating responsive image slideshow by using HTML5, CSS3 and jQuery. It also supports swiping on touch devices. It works on all modern browsers including IE 10+.
Vega is a visualization grammar, a declarative format for creating and saving interactive visualization designs.
With Vega you can describe data visualizations in a JSON format, and generate interactive views using either HTML5 Canvas or SVG.
History.js gracefully supports the HTML5 History/State APIs (pushState, replaceState, onPopState) in all browsers. Including continued support for data, titles, replaceState. It supports jQuery, MooTools and Prototype.
Paper.js is an open source vector graphics scripting framework that runs on top of the HTML5 Canvas.
It offers a clean Scene Graph / Document Object Model and a lot of powerful functionality to create and work with vector graphics and bezier curves, all neatly wrapped up in a well designed, consistent and clean programming interface.