Free ad exchange framework for Android?
<p>I know that Android has some ad networks to monetize the apps. But I'm looking for an ads systems that allows me to advertise for free on other apps/games, and at the same time I advertise them on mine.</p>

<p>In windows phone we have this: <a href="http://www.adduplex.com/" rel="nofollow">http://www.adduplex.com/</a></p>

<p>Is there something similar for Android?</p>
