PixiJS is the HTML5 creation engine that you can create beautiful digital content with the fastest, most flexible 2D WebGL renderer.
Matter.js is a 2D rigid body physics engine for the web written in JavaScript.
SpriteJS is a lightweight 2D canvas rendering engine for modern browsers. Manipulate the sprites in canvas as you do with the DOM elements.
SpriteJS can be used with D3.js, Proton and Matter-js.
Planck.js is a 2D JavaScript physics engine for cross-platform HTML5 game development.
jquery.transform.js adds 2D transform capabilities to jQuery css() and animate() functions.