I publicly admit that I love Javascript and all the possibilities it offers, and of course one of them is creating an asynchronous scrolling effect, also known as Parallax.
This library is perfect to do it with little effort, since it comes standard with many things already prepared with which it will be really easy to create this famous and increasingly well-known effect.
Furthermore, it is ideal for lightweight websites, as it does not depend on jQuery to function , which is a big plus.
Source | WebResourcesDepot