Varnish is a reverse caching proxy.

Cloud CDN uses Google's global edge network to serve content closer to users.

Google Cloud is a suite of cloud computing services.

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

Node.js is an open-source, cross-platform, JavaScript runtime environment that executes JavaScript code outside a web browser.

Express is a web application framework for Node.js, released as free and open-source software under the MIT License. It is designed for building web applications and APIs.

Angie is a drop-in replacement for the Nginx web server aiming to extend the functionality of the original version.

C is a general-purpose, procedural computer programming language supporting structured programming, lexical variable scope, and recursion, with a static type system.

Perl is a family of two high-level, general-purpose, interpreted, dynamic programming languages.

PayPal is an online payments system that supports online money transfers and serves as an electronic alternative to traditional paper methods like checks and money orders.