Marionette Studio - Marionette Studio is an online animation software for beginners and professionals. Animate 2D characters and environments in minutes with no prior skills.
Animista - Create beautiful CSS animations in your browser
Lottie by Airbnb - Easily add high-quality animation to any native app
CSS Animation Cheat Sheet - Awesome CSS3 plugin for spiffy animations
useAnimations - An animated icon library for your projects
Keyframes.app - A timeline editor for CSS animations