FreeOrion

Source code repository of the FreeOrion project

This is an exact mirror of the FreeOrion project, hosted at https://github.com/freeorion/freeorion. SourceForge is not affiliated with FreeOrion.

Downloads: 3 This Week

Last Update: 2026-02-26

Get an email when there's a new version of FreeOrion

Linux Mac Windows

FreeOrion is a turn-based space empire-building game inspired by the classic Master of Orion series, with an emphasis on modularity, modding, and strategic depth. Built using C++ and Python, it features a flexible game engine and a custom UI tailored to 4X (eXplore, eXpand, eXploit, eXterminate) gameplay. Players manage planets, design ships, conduct research, engage in diplomacy, and wage war across a procedurally generated galaxy. FreeOrion offers a unique tech tree, customizable empires, and supports multiplayer for competitive or cooperative play. It's community-driven, open-source, and under active development.

Features

Procedurally generated galaxy maps with customizable parameters
Unique, non-linear tech tree system for research strategies
Turn-based empire management, exploration, and combat
Fully moddable with scripting support using Python
Multiplayer support with LAN and internet play
Customizable ship design system with modular components
In-game chat and diplomacy systems for player interaction
UI built using custom GUI toolkit with theming support
Cross-platform support for Windows, Linux, and macOS

Project Samples

FreeOrion Screenshot 1

Project Activity

See All Activity >

Categories

Follow FreeOrion

FreeOrion Web Site

Other Useful Business Software

Go From AI Idea to AI App Fast Icon

Go From AI Idea to AI App Fast

One platform to build, fine-tune, and deploy ML models. No MLOps team required.

Access Gemini 3 and 200+ models. Build chatbots, agents, or custom models with built-in monitoring and scaling.

Try Free

Rate This Project

Login To Rate This Project

User Reviews

Be the first to post a review of FreeOrion!

Additional Project Details

Operating Systems

Linux, Mac, Windows

Programming Language

Related Categories

C++ Games

Registered

2025-03-24

Report inappropriate content

Go From AI Idea to AI App Fast

One platform to build, fine-tune, and deploy ML models. No MLOps team required.

Access Gemini 3 and 200+ models. Build chatbots, agents, or custom models with built-in monitoring and scaling.

Try Free

Recommended Projects

Free Space Colonization
FSC is a game of colonization, research, diplomacy and trade. A 4X approach.It is played on randomly generated maps, the aim is to build an empire and rule most of the galaxy. For rule details see the project docs. It needs SDL and OpenGL to run.
Stellar Legacy
Stellar Legacy is a turn based strategy game (similar to stars!, MOO etc.) set in space. The player controls an inter-stellar empire in a galaxy of other empires who could be friendly, secretive, hostile or however the other players wish to play.
Merchant Empires
Merchant Empires is a multiplayer, web-based game of space exploration and economic competition. It is a game of strategy, role-playing, combat, and diplomacy. Merchant Empires is loosely based on both Trade Wars and Space Merchant.
Solar Empire
Solar Empire is a GPL/public domain browser-based strategy game (BBS) written in PHP. Users control fleets, planets and equipment to conquer the galaxy. Almost limitless variation given by advanced customisation options.
Diplomacy Cicero
Code for Cicero, an AI agent that plays the game of Diplomacy