What are some alternatives?
Adform - Adform is an ad tech partner for media agencies, trading desks and publishers.
BuySellAds - BuySellAds.com Online Advertising Network
Sonobi - Sonobi is an advertising technology that offers a solution for publishers, media agencies and advertiser brands to drive results.
MyBuys - MyBuys provides coordinated, cross-channel personalization services for Display Ads, Email and Websites
Newsmax Feed Network - Newsmax Feed Network is a fast, easy and inexpensive way to reach new customers through targeted content streams.
BlogHer Publishing Network - BlogHer Publishing Network is a premium ad network for bloggers who create excellent content and conversations with women.