emotion : emotion is a high performance, lightweight css-in-js library that supports both string and object based styles.
Anime.js : Anime.js is a fast, multipurpose and lightweight JavaScript animation library with a simple, yet powerful API.
It works with CSS properties, SVG, DOM ...
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.
Photon : UI toolkit for building desktop apps with Electron.
Selectivizr : CSS3 pseudo-class and attribute selectors for IE 6-8
