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.
Lightbox is small javascript library used to overlay images on top of the current page.
MkDocs is a static site generator, used for building project documentation.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Timeago is a jQuery plugin that makes it easy to support automatically updating fuzzy timestamps.
Varnish is a reverse caching proxy.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.