What It Is: OpenX is a long-standing, well known ad server which offers users the ability to execute campaigns with both direct and programmatic tools built into the UI.
Key Features: OpenX features the ability to micro-target audiences, customization of campaign reporting, and excellent analytics, with access to 12 months of historical data. OpenX is also popular among users for its responsive, 24/7 customer service and support. The ad server is integrated with the OpenX Ad Exchange, where users can sell additional and unsold ad space.
Cost: While OpenX is not forthcoming about their pricing, sources report that it is on the higher side for hosted ad servers.
Who It’s For: OpenX is most appropriate for larger publishers that serve a high number of ads monthly. Because of its cost, OpenX may not be the best option for those working with a low ad budget or without the need for large scale solutions.