Flickity - touch enabled and responsive gallery
Do you want "Node.JS but in PHP" ? :) ReactPHP Event-driven, non-blocking I/O with PHP, looks like trying to do it. Should look closer on it.
Flickity - touch enabled and responsive gallery
Waypoints is a JS library that makes it easy to execute a function whenever you scroll to an element.
snabbt.js - minimalistic animation library in JavaScript
Chartspree.io - kind a Lorem Ipsum charts. Allow to insert chart as image src.
Hover.css - a great collection of CSS3 powered hover effects to be applied to links, buttons, logos, SVG, featured images and so on.