ads networks for desktop app?

i'm looking for an ads networks for a desktop app that i'm working on.

so far i was able to embed revenuehits, propellerads and cpalead banners in the app without any issues or bugs from the app when it shows the ads.

i want to add some (2 - 3) others networks, anyone knows about good ads networks for beginners ?

thanks in advance for all the help.