Yager Development GmbH

Describes development of aerial 3D combat/action game, with news, team profiles, and contact information.
http://www.yager-development.com/

Yggdrasil Games

The Production Arm of SoftWorlds, who distributes their games. Games include The Quiddity, Market$hare, and v'Magine.
http://sw.itgo.com/yggdrasil/

Yes Ten Style

Polish game developer of such titles as Volleyball 04 and Armored Punch. Available in Polish and English.
http://www.yes10style.com/