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.
Google Analytics is a free web analytics service that tracks and reports website traffic.
Issuu is a digital discovery and publishing platform.
Square is a mobile payment company that offers business software, payment hardware products and small business services.
Typekit is an online service which offers a subscription library of fonts.
Varnish is a reverse caching proxy.