What are some alternatives?
Shareaholic - Shareaholic is trusted by over 300000 brands, businesses, agencies, and individuals to grow website traffic and engagement 24 hours a day, 7 days a week.
OpenX - Ad technology platform available as a hosted service or as an open source download.
Qadabra - Qadabra Network Description. Qadabra is a self-serve ad platform created explicitly for publishers looking to monetize their website traffic by earning revenue through performance-based advertising.
AdRoll - AdRoll is a leader in retargeting display advertising. Draw the right people with the right strategies.
Revcontent - Revcontent is the world's fastest growing content recommendation network, powering over 250 billion content recommendations per month.
Epom Ad Server - An ad serving solution for publishers, advertisers, ad and affiliate networks