cdnjs is a free distributed JS library delivery service.
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.
Font Awesome is a font and icon toolkit based on CSS and Less.
FormBold is a complete web forms solution for static websites that allows you to create forms, collect data, and send notifications.
GitHub Pages is a static site hosting service.
Varnish is a reverse caching proxy.