IPInfoDB is the API that returns the location of an IP address.
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.
MaxMind is a provider of geolocation and online fraud detection tools.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
Open Graph is a protocol that is used to integrate any web page into the social graph.
WP Rocket is a caching and performance optimisation plugin to improve the loading speed of WordPress websites.
Yoast SEO is a search engine optimisation plugin for WordPress and other platforms.