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.
Hugo is an open-source static site generator written in Go.
Popper is a positioning engine, its purpose is to calculate the position of an element to make it possible to position it near a given reference element.
Varnish is a reverse caching proxy.