ASP.NET is an open-source, server-side web-application framework designed for web development to produce dynamic web pages.
Open Graph is a protocol that is used to integrate any web page into the social graph.
reCAPTCHA is a free service from Google that helps protect websites from spam and abuse.
Umbraco is an open-source Microsoft ASP.NET based content management system.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.