Anime.js - Lightweight JavaScript animation library
Animate.css - Animate.css is a cross-browser library of CSS animations.
Pixi.js - Fast lightweight 2D library that works across all devices
Animista - Create beautiful CSS animations in your browser
p5.js - JS library for creating graphic and interactive experiences
Hover.css - A collection of CSS3 powered hover effects to be applied to links, buttons, logos, etc.