What are some alternatives?
When comparing OpenX and Google Ad Manager, you can also consider the following products
AdSense - Earn money with website monetization from Google AdSense. We'll optimize your ad sizes to give them more chance to be seen and clicked.
AerServ - AerServ offers monetization solution for mobile publishers.
AppNexus - AppNexus technology powers the most innovative trading solutions and marketplaces for Internet advertising.
ONE by AOL - Ad Serving and Supply Side Platform (SSP)
AdRoll - AdRoll is a leader in retargeting display advertising. Draw the right people with the right strategies.
Smart AdServer - The only fully-integrated ad server for managing RTB, Mobile, Video & Web display. Best manage all your campaigns in one interface. Best local support