Parallax.js is simple, lightweight Parallax Engine that reacts to the orientation of a smart device. Where no gyroscope or motion detection hardware is available, the position of the cursor is used instead.
Starscroll is a jQuery plugin that adds a fullscreen starfield, generated in canvas, controlled by css to any div. The parallax responds when user scrolls (no matter how big your content), or when is set to animate.
Scrolly is a super simple and easy to use parallax plugin for jQuery.
