Spirit - The animation tool for the web.
OpenToonz - OpenToonz is an animation program that is a free software version of Toonz, the animation software...
Lottie by Airbnb - Easily add high-quality animation to any native app
Synfig Studio - Just another WordPress site
App Animations - Gallery of beautiful iOS animations to inspire your next app
Blender - Blender is the open source, cross platform suite of tools for 3D creation.