enquire.js : A lightweight, pure JavaScript library for responding to CSS media queries.
voxel.css : The goal of this project is to provide a lightweight 3D CSS library with very simple implementation.
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 ...
emotion : emotion is a high performance, lightweight css-in-js library that supports both string and object based styles.