
Here we are collected some of the most nice and useful Parallax scrolling effects which can be easily added in any website.
According to Wikipedia: Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.
Portfolio parallax page by Ivan Grozdic
Canvas Parallax Skyline Halloween by Jack Rugile
Card 3D view Parallax by Alban Bujupaj
CSS + jQuery Parallax Effect by Andrew Procacci
Simple Parallax Scrolling parallax.js by vavik
Simple parallax scrolling effect by Kristy Yeaton
Simple Parallax Scrolling by Nikko Aboy
Parallax Scrolling by Marcel Schulz
Parallax Scroll Page by anikey99
jQuery Mouse Parallax by Mikhail Zhuikov
Full Page Parallax Scroll Effect by Romswell Roswell Parian Paucar
Other Parallax jQuery plugins
jInvertScroll is a lightweight plugin for jQuery that allows you to move in horizontal with a parallax effect while scrolling down. It’s easy to setup and requires nearly no configuration.

2. Parallax.js

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.

Parallax ImageScroll is a simple and easy jQuery plugin for creating image parallax effects when scrolling the page. The plugin is really simple to use with some options to tweak. It makes use of CSS3 transform for animation where supported and falls back to top and left positioning for ancient browsers.
4. ScrollMagic

ScrollMagic is a jQuery plugin which essentially lets you use the scrollbar like a progress bar. It can animate based on scroll position, pin an element starting at a specific scroll position, toggle CSS classes of elements on and off based on scroll position and effortlessly add parallax effects to your website.
5. StarScroll

Starscroll is a jQuery plugin that adds a full screen starfield, generated in canvas, controlled by CSS to any div. The parallax responds when user scrolls (no matter how big your content), or when it is set to animate.
6. Enllax.js

Enllax.js is ultra-lightweight (~1kb) and super easy to use plugin for applying parallax scrolling effect to any scrolling element. You can set parallax scrolling effects to both foreground and background elements, and also in both directions (vertically or horizontally).
7. Parallaxie

Parallaxie is a jQuery plugin to create parallax effects on your websites or templates. It is very lightweight to download and be rendered by your browser.
8. Stellar

Stellar.js is a jQuery plugin that provides parallax scrolling effects to any scrolling element.
9. Parallaxer

Parallaxer is a lightweight jQuery plugin which utilizes CSS3 3D transforms to create a smooth parallax effect on your images when scrolling down or up.
10. Scrolly

Scrolly is a super simple and easy to use parallax plugin for jQuery.
11. Parallaxbg.js

Paralaxbg.js is a minimalist jQuery script for creating background parallax effect that make your background images move slower than foreground content as you scroll down the webpage.
12. Parally

Parally is a simple, flexible jQuery parallax scrolling plugin which can be applied to background images or any other DOM elements.