DataXu - Marketing analytics for brands and agencies.
Lotame - Make your data actionable, learn about your most valuable customers, improve ROI by targeting the right audience and increase relevance across screens.
Mapp Cloud - Mapp Cloud brings customer acquisition and customer engagement together in one simple marketing cloud infused with data intelligence.
Adobe Audience Manager - Adobe Audience Manager is a data management platform that integrates online and offline data to deliver a unified view of all your audiences
Clearbit - Clearbit provides Business Intelligence APIs
Google Audience Center - 3 votes and 6 comments so far on Reddit