Qoopido Emerge

jQuery plugin to react on elements entering or nearing the visible area.

inViewPort

jQuery plugin that adds a CSS class to selected elements when they have been scrolled into the viewport for the first time.

Beacons

A jQuery plugin to react when elements scroll into view.

whenVisible

A plugin for jQuery/Zepto that repeatedly checks an element’s visibility and fires a callback when visible.

jQuery Visibly

A jQuery Plugin designed to easily show elements based on values of other elements.