Apache is a free and open-source cross-platform web server software.
jQuery plugin for seeing if the images are loaded.
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.
ProcessWire is an open source content management system (CMS) and framework (CMF).
Unpkg is a content delivery network for everything on npm.