What are some alternatives?
OpenX - Ad technology platform available as a hosted service or as an open source download.
LeadBolt - LeadBolt is a mobile advertising platform for user acquisition and in-app monetization.
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.
Celtra - Leading creative technology for data-driven brand display advertising across all screens.
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