Below is a list of websites like MoPub / services like / similar to MoPub :
MoPub is a mobile monetization platform, providing ad serving, optimization and new ad experiences for mobile apps. Today, app developers don’t have good ways to manage their ad inventory. They typically either choose a single ad network (iAd, AdMob or AdSense) and forgo the ability to run house ads, cross promotions or book direct deals. We help developers optimize their existing banner inventory and add new mobile advertising experiences like interstitials and rich media..