CSSViewer - A simple CSS property viewer
Lottie by Airbnb - Easily add high-quality animation to any native app
CSS Animation Cheat Sheet - Awesome CSS3 plugin for spiffy animations
Marionette Studio - Marionette Studio is an online animation software for beginners and professionals. Animate 2D characters and environments in minutes with no prior skills.
Tailwind CSS - A utility-first CSS framework for rapidly building custom user interfaces.
Spirit - The animation tool for the web.