<canvas> and SVG. You can design and render simple 3D models on the Web. Zdog is a pseudo-3D engine. Its geometries exist in 3D space, but are rendered as flat shapes.
PixiJS is the HTML5 creation engine that you can create beautiful digital content with the fastest, most flexible 2D WebGL renderer.
Styletron is a universal CSS-in-JS engine built from the ground up for high-performance.