What Is Parallax Scrolling
Stellar.js is a jQuery plugin that provides parallax scrolling effects to any scrolling element.
InstaLax: Panel Based Parallax Framework.
ScrollMagic is a jQuery plugin which essentially lets you use the scrollbar like a playback scrub control.
Make Your Own
Examples of parallax style in action: 20 Best Websites with Parallax Scrolling of 2013.