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.

cdnjs is a free distributed JS library delivery service.

MySQL is an open-source relational database management system.

jQuery CDN is a way to include jQuery in your website without actually downloading and keeping it your website's folder.

Cloudflare is a web-infrastructure and website-security company, providing content-delivery-network services, DDoS mitigation, Internet security, and distributed domain-name-server services.

Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.

Yoast SEO is a search engine optimisation plugin for WordPress and other platforms.

WordPress is a free and open-source content management system written in PHP and paired with a MySQL or MariaDB database. Features include a plugin architecture and a template system.

PHP is a general-purpose scripting language used for web development.

Varnish is a reverse caching proxy.

Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.

Apache is a free and open-source cross-platform web server software.

Ubuntu is a free and open-source operating system on Linux for the enterprise server, desktop, cloud, and IoT.