Animista - Create beautiful CSS animations in your browser
Animo.js - Animo.js is a lightweight, open-source tool that enables developers to manipulate animations and transitions.
CSS Animation Cheat Sheet - Awesome CSS3 plugin for spiffy animations
Magic Animations CSS3 - CSS3 Animations with special effects.
Keyframes.app - A timeline editor for CSS animations
Ceaser - Ceaser is a handy CSS Easing Animation tool for creating any ease imaginable.