Selectivizr : CSS3 pseudo-class and attribute selectors for IE 6-8
enquire.js : A lightweight, pure JavaScript library for responding to CSS media queries.
Ink : Ink provides the same component-based UI building experience that React offers in the browser, but for command-line apps. It uses Yoga to build Flexbo...
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 ...
jQuery Masonry : A dynamic layout plugin for jQuery
The flip-side of CSS floats
