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

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

Fastly is a cloud computing services provider. Fastly's cloud platform provides a content delivery network, Internet security services, load balancing, and video & streaming services.

GitHub Pages is a static site hosting service.

Varnish is a reverse caching proxy.

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.

Unpkg is a content delivery network for everything on npm.

Ruby is an open-source object-oriented programming language.

cdnjs is a free distributed JS library delivery service.

Jekyll is a blog-aware, static site generator for personal, project, or organisation sites.