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FreeOrion is a free, Open Source, turn-based space empire and galactic conquest computer game.

FreeOrion is inspired by the tradition of the Master of Orion games, but does not try to be a clone or remake of that series or any other game. It builds on the classic 4X (eXplore, eXpand, eXploit and eXterminate) model.

By adding scripting capabilities to the game engine the FreeOrion project aims to give the community an easy way to customize the game mechanics and presentation to create a living, breathing universe in a grand campaign model.


FreeOrion requires an OpenGL 2.1 capable graphic card and a display with a suggested minimum resolution of at least 1280x800.

Recent releases of FreeOrion require at least Windows 8.1 or later, macOS 10.12 or later or any reasonably recent Linux distribution on x86 compatible processors, such as Ubuntu 20.04 or 22.10. Other operating systems and architectures have reported to be working by users, but are not actively supported by the FreeOrion project.


FreeOrion Stable Releases are the recommended way to play FreeOrion. Stable Releases can be obtained as native installer binaries for Windows and Mac OSX or as source releases for Linux and other UNIX-ish platforms from GitHub.

Some Linux distributions like Fedora, Debian and Arch provide packages of FreeOrion. Alternatively, FreeOrion is also available on Flathub.

FreeOrion Weekly Releases are in-development releases intended for enthusiasts and testers, who want to track or contribute to the development. Weekly Releases can be obtained as native installer binaries for Windows and Mac OSX from Sourceforge.


For Windows, execute the native installer binary and follow the on-screen instructions of the installer to install FreeOrion.

For Mac OSX, open the downloaded DMG file and copy the contained FreeOrion application to your system Applications folder by Drag and Drop.

For Linux or other from-source installations, refer to the Build Instructions.

Various Linux distributions provide the stable release of FreeOrion in a prebuilt way. Usually you can install those packages by either using a graphical package manager and searching for FreeOrion or by installing the packages via the command line.

To install FreeOrion from Flathub, follow the instructions to install Flatpak and Flathub and then install FreeOrion.


  • install directory
    The location of this file, called <install_dir> below.
  • config - game settings
    Called <config_dir> below.
    • linux
      $XDG_CONFIG_HOME/freeorion which defaults to ~/.config/freeorion
    • OSX
      $HOME/Library/Application Support/FreeOrion/ which defaults to ~/Library/Application Support/FreeOrion/
    • Windows
  • data - local user data, saved games, log files
    Called <data_dir> below.
    • linux
      $XDG_DATA_HOME/freeorion which defaults to ~/.config/freeorion
    • OSX
      $HOME/Library/Application Support/FreeOrion/ which defaults to ~/Library/Application Support/FreeOrion/
    • Windows
  • resource directory - audio, visual and textual UI content, python scripts
    Called <resource_dir> below.
    <resource_dir> can be redirected in <config_dir>/config.xml or <config_dir>/persistent_config.xml
  • stringtables - translation indices for various languages
  • scripting - FreeOrion Content Scripts (FOCS) describing game content (tech, species etc.)
  • AI - AI for computer controlled empires

Contact and Getting Help

Visit the FreeOrion Homepage to learn more about the project. Also you can get in touch with the FreeOrion developers and join the community in the FreeOrion Forum.


The FreeOrion project encourages anybody to contribute to FreeOrion. For more details please see the Contribution Guidelines.


The FreeOrion source code is licensed under the terms of GPL v2, game assets are licensed under the terms of CC-BY-SA-3.0 and game content scripts are licensed under the terms of both GPL v2 and CC-BY-SA-3.0. For more details please see the License File.

Additional to the immediate project sources, the FreeOrion source tree bundles some third party projects or assets which may be also licensed under different terms than the FreeOrion project. For more details please consult the accompanying license file.

  • GiGi library located within the GG/ directory.
  • Roboto font located within the default/data/fonts/ directory.
  • DejaVuSans located within the default/data/fonts/ directory.