wow.js is a JavaScript plugin that reveals animations when you scroll.
Tools
Tilt.js, a small easy to use parallax hover tilt effect for jQuery.
Add a lightweight vanilla javascript parallax library to your website for subtle animations.
Midnight.js is a jQuery plugin that lets you subtly change your headers to make them match the content as you scroll.
Library for animated image backgrounds.
Drop-in CSS transitions.
Animate On Scroll library using CSS3.
Atropos is a lightweight, free and open-source JavaScript library to create stunning touch-friendly 3D parallax hover effects.
Create badass, fluid and smooth transition between your website's pages.
A simple scroll library used by developers at Locomotive.
Easy Parallax Effect for React & JavaScript.