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.
Svelte is a free and open-source front end compiler created by Rich Harris and maintained by the Svelte core team members.
Unpkg is a content delivery network for everything on npm.
Varnish is a reverse caching proxy.