Amazon Advertising (formerly AMS or Amazon Marketing Services) is a service that works in a similar way to pay-per-click ads on Google.
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.
Modernizr is a JavaScript library that detects the features available in a user's browser.
Octopress is a static blogging framework.
Varnish is a reverse caching proxy.