Parallax effects are awesome. Having elements move in the different speed during scrolling can easily provide the unique feeling for the application. So here are some modern JavaScript libraries that you can use to add animated parallax to any image.
Atropos
Stunning touch-friendly 3D parallax hover effects.
Rolly
Custom scroll with inertia, smooth parallax and scenes manager.
Motus
Animation library that mimics CSS keyframes when scrolling.
Ukiyo Js
Simple and lightweight JavaScript library for modern background parallax, with support for picture elements and any images.
Lax.js
Simple & lightweight vanilla JavaScript library to create smooth & beautiful animations when you scroll.
Parallax Effect
Parallax effect in javascript using face tracking. An immersive view in 3d with webcam.
Rallax.js
It is a very simple and tiny JavaScript library that adds animated parallax to any image. The parallax effect is applied directly to image identifiers, as most other parallax libraries do, so there is no need to use a background image. Parallax effects can be applied to a production website without breaking its structure.
Luxy.js
Inertia scroll and parallax effect plugin in Vanilla.js.
Paroller.js
A lightweight jQuery plugin that enables parallax scrolling effect. You can use it on elements with background property or on any other element. While scrolling elements can move: vertical, horizontal. Manipulated through html data attributes or jQuery options.
Smooth Parallax
Smooth Parallax makes it a lot easier to move objects when the page scroll with ease.
Great selection, Rolly added to my bookmarks )