Apache is a free and open-source cross-platform web server software.
jQuery CDN is a way to include jQuery in your website without actually downloading and keeping it your website's folder.
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.
PHP is a general-purpose scripting language used for web development.
Silverstripe CMS is a free and open source Content Management System and Framework for creating and maintaining websites and web applications.
Unix is a family of multitasking, multiuser computer operating systems.