Photon : UI toolkit for building desktop apps with Electron.
polyfill : polyfill makes web development less frustrating by selectively polyfilling just what the browser needs. Use it on your own site, or as a service.
voxel.css : The goal of this project is to provide a lightweight 3D CSS library with very simple implementation.
Selectivizr : CSS3 pseudo-class and attribute selectors for IE 6-8
Styletron : Styletron is a universal CSS-in-JS engine built from the ground up for high-performance.