Lax.js - Create beautiful & smooth animations when you scroll
Sketch Repo - Collection of resources for anyone who uses Sketch
WOW.js - Animate elements on-scroll to catch attention. Such Magic.
Anima App - Design, get feedback, convert to code, publish, iterate.
ScrollMagic - The jQuery plugin for magical scroll interactions.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.