What are some alternatives?
When comparing Sharethrough and Google Ad Manager, you can also consider the following products
StackAdapt - Native advertising demand side platform.
OpenX - Ad technology platform available as a hosted service or as an open source download.
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.
Adobe Advertising Cloud - Adobe Advertising Cloud is ads providing a platform that lets your media-related thing to lift on the high note.
ONE by AOL - Ad Serving and Supply Side Platform (SSP)