Animate.css - Animate.css is a cross-browser library of CSS animations.
Animista - Create beautiful CSS animations in your browser
CSS Animation Cheat Sheet - Awesome CSS3 plugin for spiffy animations
Hover.css - A collection of CSS3 powered hover effects to be applied to links, buttons, logos, etc.
Keyframes.app - A timeline editor for CSS animations
Anime.js - Lightweight JavaScript animation library