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

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

WebSocket is a communication protocol that provides full-duplex communication channels over a single, long-lived connection, enabling interactive communication between web browsers and servers.

Google Sign-In is a secure authentication system that reduces the burden of login for users, by enabling them to sign in with their Google account.