Apache is a free and open-source cross-platform web server software.
Cosmic is a cloud-based CMS that provides developers with an API and web interface for content management, enabling the creation of custom content types, relationship definitions, and webhooks for actions based on content changes.
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.
Varnish is a reverse caching proxy.