CentOS is a Linux distribution that provides a free, community-supported computing platform functionally compatible with its upstream source, Red Hat Enterprise Linux (RHEL).

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

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

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

Query Migrate is a javascript library that allows you to preserve the compatibility of your jQuery code developed for versions of jQuery older than 1.9.

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.

Bootstrap is a free and open-source CSS framework directed at responsive, mobile-first front-end web development. It contains CSS and JavaScript-based design templates for typography, forms, buttons, navigation, and other interface components.

MySQL is an open-source relational database management system.

Perfmatters is a performance optimisation plugin for WordPress websites.

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

Gravatar is a service for providing globally unique avatars.

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.

Sites using the WordPress Block Editor, also known as Gutenberg.

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