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netadge - NetAdge is a mobile demand-side platform.
Lotame - Make your data actionable, learn about your most valuable customers, improve ROI by targeting the right audience and increase relevance across screens.
AdLib DSP - The Premium DSP Everyone. Reach Your Audience On The World's Most Popular Sites, Apps, & Streaming Platforms. No Contracts. No Minimums.
Google Audience Center - 3 votes and 6 comments so far on Reddit
Persona.ly - Persona.ly offers game and app developers advanced tools for creating in-app advertising and acquiring quality users.