For US companies, you can always look to Brigade Games for good stuff. Their catalog may seem wonky, but it has some prime stuff in there. Also I'll put in a pitch for Conquest and their American Indians. And if you want fun sci-fi, there's the Quar from Zombiesmith.
Now, in the interest of full disclosure, I have business or personal ties (or both) with these companies. But I have ties with these companies because they are good companies run by people with good product - I was a fan of their work long before I was a business partner or a friend.