Apache is a free and open-source cross-platform web server software.
cdnjs is a free distributed JS library delivery service.
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.
RequireJS is a JavaScript library and file loader which manages the dependencies between JavaScript files and in modular programming.
Varnish is a reverse caching proxy.
Reveal CSS animation as you scroll down a page.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.