Paper.js - Open source vector graphics scripting framework that runs on top of the HTML5 Canvas.
Shield UI Charts - JavaScript Chart Types - Our HTML5 and JavaScript chart is a fast, feature-rich data visualization control. It offers over 23 different chart types and flexible API for additional customization.
p5.js - JS library for creating graphic and interactive experiences
Raphael - Raphael.js is an Object Oriented drawing library. It is good at making in-depth diagrams with complex interactions.
Three.js - A JavaScript 3D library which makes WebGL simpler.
Pixi.js - Fast lightweight 2D library that works across all devices