OpenX - Ad technology platform available as a hosted service or as an open source download.
Reddit - Reddit gives you the best of the internet in one place. Get a constantly updating feed of breaking news, fun stories, pics, memes, and videos just for you.
Metamarkets - We help programmatic buyers, sellers and marketplaces make better decisions in real-time.
Contextly - Contextly provides content recommendation system for publishers.
Ezoic - Improve & test ads, layouts, & content using artificial intelligence to increase website ad revenue & UX metrics. Google Adsense & Google Publishing Partner
Digg - Digg delivers the most interesting and talked-about stories on the Web right now.