cdnjs is a free distributed JS library delivery service.
CreateJS is a suite of modular libraries and tools which work together or independently to enable interactive content on open web technologies via HTML5.
Google Hosted Libraries is a stable, reliable, high-speed, globally available content distribution network for the most popular, open-source JavaScript libraries.
jQuery is a JavaScript library which is a free, open-source software designed to simplify HTML DOM tree traversal and manipulation, as well as event handling, CSS animation, and Ajax.