Apple Sign-in is based on OAuth 2.0 and OpenID Connect, and provides a privacy-friendly way for users to sign in to websites and apps.
cdnjs is a free distributed JS library delivery service.
Facebook pixel is an analytics tool that allows you to measure the effectiveness of your advertising.
Cloud CDN uses Google's global edge network to serve content closer to users.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.