Varnish is a reverse caching proxy.

Apache is a free and open-source cross-platform web server software.

PHP is a general-purpose scripting language used for web development.

Unpkg is a content delivery network for everything on npm.

Bootstrap is a free and open-source CSS framework directed at responsive, mobile-first front-end web development. It contains CSS and JavaScript-based design templates for typography, forms, buttons, navigation, and other interface components.

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.

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.

JSDelivr is a free public CDN for open-source projects. It can serve web files directly from the npm registry and GitHub repositories without any configuration.

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.

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

cdnjs is a free distributed JS library delivery service.

Fly is a platform for running full stack apps and databases.