Azure Front Door is a scalable and secure entry point for fast delivery of your global web applications.
cdnjs is a free distributed JS library delivery service.
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.
Microsoft Ajax Content Delivery Network hosts popular third party JavaScript libraries such as jQuery and enables you to easily add them to your web applications.
reCAPTCHA is a free service from Google that helps protect websites from spam and abuse.