Alternative Solutions to Oracle BlueKai for Audience Targeting in Programmatic Ads

I have been using Oracle's BlueKai and Audience Marketplace for some time to acquire audiences through neat deal IDs for my OpenX platform. Now that Oracle is exiting this space, I'm unsure where to turn next. The prospect of reaching out to multiple audience providers and managing numerous deals feels quite overwhelming. Does anyone have recommendations for similar services that I can start exploring?