BradyA camera library with parallax scrolling and aspect ratios for LÖVE.
FFBackgroundParallaxBackground Parallax is a simple example for parallax scrolling based on several UIScrollViews.
ParallaxieEasiest, Responsive and Customizable Parallax jQuery Plugin
smooth-parallaxSmooth Parallax makes it a lot easier to move objects when the page scroll with ease.
universal-parallaxEasy parallax plugin using pure javascript. Also works on mobile platforms. Cross browser support.