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

reCAPTCHA is a free service from Google that helps protect websites from spam and abuse.

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.

Contact Form 7 is an WordPress plugin which can manage multiple contact forms. The form supports Ajax-powered submitting, CAPTCHA, Akismet spam filtering.

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

Google AdSense is a program run by Google through which website publishers serve advertisements that are targeted to the site content and audience.

MySQL is an open-source relational database management system.

Google Analytics is a free web analytics service that tracks and reports website traffic.

Site Kit is a one-stop solution for WordPress users to use everything Google has to offer to make them successful on the web.

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.

cdnjs is a free distributed JS library delivery service.

Google Hosted Libraries is a stable, reliable, high-speed, globally available content distribution network for the most popular, open-source JavaScript libraries.

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.