KOSMOS is one the most successful game producers in Europe. Many of their titles have crossed the ocean to be published by Rio Grande Games (many of the Kosmos Two-Player Series of games) and Mayfair Games (Settlers of Catan. KOSMOS board games are played in many countries across the globe and are partly responsible for the success of German Games in the United States.
Unfortunately, not all of their games have received a U.S. publishing. So, we've imported a few ourselves, like the awesome Keltis series of games.