Websites that have a shopping cart or checkout page, either using a known ecommerce platform or a custom solution.
DoubleClick Ad Exchange is a real-time marketplace to buy and sell display advertising space.
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 AdSense is a program run by Google through which website publishers serve advertisements that are targeted to the site content and audience.
Varnish is a reverse caching proxy.