Lax.js - Create beautiful & smooth animations when you scroll
Platforma - Wireframe library of layouts and UI elements
WOW.js - Animate elements on-scroll to catch attention. Such Magic.
Contra Wireframe Kit - Open source wireframe kit for design and prototyping 🚀
ScrollMagic - The jQuery plugin for magical scroll interactions.
Source Wireframe Kit - Library of 537 blocks for desktop and mobile prototyping