Keep multiple browsers & devices in sync when building websites. http://browsersync.io
Delightful, performance-focused pure css loading animations.
Micro check library
Reveal CSS animation as you scroll down a page
Lightweight, robust, elegant syntax highlighting. A spin-off project from Dabblet.
UI automated testing framework based on node.js and selenium webdriver
HTML5 <audio> or <video> player with Flash and Silverlight shims that mimics the HTML5 MediaElement API, enabling a consistent UI in all browsers.
Declarative on-scroll reveal animations.
A fast & lightweight polyfill for min/max-width CSS3 Media Queries (for IE 6-8, and more)
A lightweight library for manipulating and animating SVG