emotion : emotion is a high performance, lightweight css-in-js library that supports both string and object based styles.
voxel.css : The goal of this project is to provide a lightweight 3D CSS library with very simple implementation.
Styletron : Styletron is a universal CSS-in-JS engine built from the ground up for high-performance.
Selectivizr : CSS3 pseudo-class and attribute selectors for IE 6-8
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.