FreeOrion
FreeOrion 0.4.1 Stable / 5611 Test for Windows
FreeOrion Project Games / Simulation
This is a complex turn-based space strategy game (4X)
FreeOrion is a free, open source, turn-based space empire and galactic conquest (4X) computer game being designed and built by the FreeOrion project. FreeOrion was inspired by the tradition of the Master of Orion games, but is not a clone or remake of that series or any other game.

Game Summary:

You can run FreeOrion on Windows operating systems. FreeOrion is a game developed by FreeOrion Project and it is listed in the Games category under Simulation. FreeOrion is a free game and it is fully functional for an unlimited time although there may be other versions of this game.

Alternatives in Games on Windows