Lottie by Airbnb - Easily add high-quality animation to any native app
Lax.js - Create beautiful & smooth animations when you scroll
Marionette Studio - Marionette Studio is an online animation software for beginners and professionals. Animate 2D characters and environments in minutes with no prior skills.
WOW.js - Animate elements on-scroll to catch attention. Such Magic.
Spirit - The animation tool for the web.
ScrollMagic - The jQuery plugin for magical scroll interactions.