cdnjs is a free distributed JS library delivery service.
Google Analytics is a free web analytics service that tracks and reports website traffic.
Google Tag Manager is a tag management system (TMS) that allows you to quickly and easily update measurement codes and related code fragments collectively known as tags on your website or mobile app.
Plesk is a web hosting and server data centre automation software with a control panel developed for Linux and Windows-based retail hosting service providers.
POWR is a cloud-based system of plugins that work on almost any website.
reCAPTCHA is a free service from Google that helps protect websites from spam and abuse.
Umbraco is an open-source Microsoft ASP.NET based content management system.