Widdit or mobario simlar ad network ?

Does Widdit or Mobario like ad network can suggest ?

Sorry for my english

There are many alternatives and a quick browse in this forum will give you multiple options.

If you want to explore native ads, make sure to check out http://www.avocarrot.com (disclaimer: I work there)

Is it compatible with google policies ?

Yes, fully compatible with the latest Google Developer Policy and we keep an eye on any updates to make sure as an ad network we are in full compliance.

You can check this article for more details: Will Your Mobile Ad Network Get You Banned From Google?

Do you have unity plugin ?

No official support for Unity yet.