FreeOrion, inspired by Master of Orion games (but is not a clone or remake of that series or any other game), incorporates the nation-building elements of games such as Europa Universalis 2 and a versatile tactical combat engine. While its modular design allows for a significant degree of customization of the game engine and the story elements by the community, the development team is dedicated to the construction of a living, breathing universe in a 'grand campaign' model.
FreeOrion Screenshots
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FreeOrion system requirements
Download FreeOrion
Ubuntu users can download and install FreeOrion (the latest version) from PlayDeb.
Download FreeOrion for Windows, Linux and Mac OSX.
You should also try Vega Stryke, a free, open source space simulation game for Windows, Linux and Mac OSX.