emotion : emotion is a high performance, lightweight css-in-js library that supports both string and object based styles.
SVG Web : SVG Web is a JavaScript library which provides SVG support on many browsers, including Internet Explorer, Firefox, and Safari. Using the library plus ...
Styletron : Styletron is a universal CSS-in-JS engine built from the ground up for high-performance.
enquire.js : A lightweight, pure JavaScript library for responding to CSS media queries.
Selectivizr : CSS3 pseudo-class and attribute selectors for IE 6-8