StackAdapt - Native advertising demand side platform.
Google Ad Manager - Grow revenue wherever your users are with an integrated ad management platform that surfaces insights for smarter business decisions.
Nativo - Nativo is an advertising technology platform for brand advertisers and publishers to scale, automate, and measure native ads
AerServ - AerServ offers monetization solution for mobile publishers.
Zemanta - Zemanta is an online content and links suggesting platform that provides a plugin to the bloggers, publishers and other types of content creators.
OpenX - Ad technology platform available as a hosted service or as an open source download.