Interfacer - Collection of more than 200+ free design resources
Lottie by Airbnb - Easily add high-quality animation to any native app
Facebook Design Resources - A collection of free resources made by designers at Facebook
Marionette Studio - Marionette Studio is an online animation software for beginners and professionals. Animate 2D characters and environments in minutes with no prior skills.
Freebiesbug - Collection of the best free web design resources.
Spirit - The animation tool for the web.