Endurance Page Cache adds basic file-based caching to WordPress.
Google Analytics is a free web analytics service that tracks and reports website traffic.
Instapage is a cloud-based landing page platform designed for marketing teams and agencies.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
Open Graph is a protocol that is used to integrate any web page into the social graph.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.