UX Challenges - Done reading about UX? Start doing it.
Lottie by Airbnb - Easily add high-quality animation to any native app
Uxcel - The easiest way to learn UX/UI design
Marionette Studio - Marionette Studio is an online animation software for beginners and professionals. Animate 2D characters and environments in minutes with no prior skills.
uxtoast: Learn UX Design - Become familiar with design laws and learn how to use them.
Spirit - The animation tool for the web.