Space Engine - Space Engine is a realistic virtual Universe you can explore on your computer.
Zentia - Zentia is a Free-to-play, 3D Action-Adventure, Strategy, MMORPG, Fantasy and Browser-based video game developed by Pixel Soft and published by ChangYou.
Celestia - Real-time 3D visualization of space
Sherwood Dungeon - Sherwood Dungeon is a Wonderful, Adventure, Massively Multiplayer Online, Role-playing, Fantasy and Browser-based video game developed and published by Maid Marian.
Stellarium - Stellarium is a free open source planetarium for your computer.
Knight Online - Knight Online is a Free-to-play, Action-Adventure, Massively Multiplayer Online, Fantasy, Browser-based and Role-playing video game developed by Noah System, and published by NTTGame.