Which alternatives to Admob do you know for working ads in-App?

I want to introduce you Mobeleader, a spanish mobile network that works ads in-App. 

Developers can make their applications profitable through this network. 

They have good rates, cover the whole inventory and their system is configurated to show one impression per user per session. 

You can check the information in their website http://www.mobeleader.com

Which other networks are you working with?