UX Flow Wireframe Prototyping System - Create beautiful user flows prototypes for your next project
ScrollMagic - The jQuery plugin for magical scroll interactions.
React Proto - React application design and prototyping tool
Lax.js - Create beautiful & smooth animations when you scroll
Balsamiq Mockups 3 - New public beta for the popular prototyping tool
ScrollReveal - ScrollReveal is a tool to add scroll animations for web and mobile browsers.