Animista - Create beautiful CSS animations in your browser
Keyframes.app - A timeline editor for CSS animations
vov.css - A small class-based animation library consisting of small but useful animations.
CSS Animation Cheat Sheet - Awesome CSS3 plugin for spiffy animations
Animate.css - Animate.css is a cross-browser library of CSS animations.
AniJS - A Library to Raise your Web Design without Coding.