Free & Open Source Simulation Games
256 free, open-source simulation games — real clones and remakes you can download, inspect the source of, and modify. Not just free to play: the code itself is open.
Active
Clone of F-15 Strike Eagle II
A from-scratch reconstruction of F-15 Strike Eagle 2's 1991 DOS source, built via binary analysis, now largely complete and playable.
Halted
Original game image
Original game imageClone of Space Station 13
A defunct, unfinished remake of Space Station 13 with original sprites replaced by placeholder art.
Active
Clone of Mad TV
TVTower is a free, open-source tribute to the 1991 TV-station management game Mad TV.
Platforms:Windows
Stars136
Updated1 month ago
LicenseUnknown
Release2014
Genre: Strategy
Theme: Management
Sporadic
Original game image
Original game imageClone of SimCity
ElCity is a minimal city-building simulation that runs inside Emacs, implementing classic city-sim systems like pollution and crime.
Platforms:Emacs
Stars131
Updated8 months ago
LicenseUnknown
Release2026
Genre: Simulation
Theme: Management
HaltedOriginal game image
Original game imageClone of Space Station 13
Griefly is an open-source C++14/Qt remake of Space Station 13, with separate client and server executables for Windows, Linux, and macOS.
Sporadic
Original game image
Original game imageClone of Pharaoh
A fork of Julius/Augustus adapted to run Pharaoh; unfinished, but it plays the first few campaign missions.
Platforms:WindowsLinuxOSX
Stars126
Updated9 months ago
LicenseAGPL-3.0
Release2020
Genre: Simulation
Theme: Ancient History
Halted
Original game image
Original game imageClone of The Sims Online
A from-scratch C# reconstruction of The Sims Online, run via a self-hosted Docker server on port 3077.
Platforms:Windows
Stars123
Updated1 year ago
LicenseUnknown
Release2012
Genre: Simulation
Theme: Management
Halted
Clone of Theme Hospital
CorsixTH for Android, a port of CorsixTH that needs the original Theme Hospital files or the demo.
Stars115
Updated1 year ago
LicenseUnknown
Release2012
Genre: Strategy
Theme: Management
Halted
Clone of Cart Life
Richard Hofmeier's original Cart Life source code, released free after leaving Steam, built with Adventure Game Studio.
Halted
Original game image
Original game imageClone of The Incredible Machine
An open-source physics puzzle game where you combine mechanical objects to reach a goal; playable beta with over 80 levels.
Active
Clone of Allegiance
Free Allegiance is an open-source project built with Visual Studio and DirectX, split into client, server, lobby, and logic components.
Sporadic
Clone of Factorio
A personal from-scratch attempt to recreate Factorio's gameplay in C++, built with CMake and now developed only sporadically.
Active
Clone of Transport Tycoon
A free, open-source transport simulator inspired by Transport Tycoon, with swappable community graphics packs and online multiplayer.
Platforms:WindowsLinuxOSX
Stars100
Updated2 months ago
LicenseUnknown
Release2022
Genre: Strategy
Theme: Management
Active
Clone of Star Wars: X-Wing
An open-source X-Wing reimplementation for Windows, macOS and Linux that runs the 1994 and 1998 editions' original game data.
Stars100
Updated1 month ago
LicenseUnknown
Release2026
Genre: Simulation
Theme: —
Halted
Clone of Elite II
GLFrontier reimplements the Atari ST game Frontier, built on reverse-engineered code plus parts from the Hatari emulator.
Sporadic
Original game image
Original game imageClone of Animal Crossing
A work-in-progress PC port of GameCube Animal Crossing that ships no assets and needs your own copy of the game.
Platforms:WindowsLinuxOSX
Stars88
Updated6 months ago
LicenseCC0-1.0
Release2025
Genre: Simulation
Theme: —
Active
Clone of Ship Simulator 2006
Bridge Command is a GPL-licensed ship-handling simulator built in C++ on the Irrlicht engine, for Windows, Linux, and macOS.
Platforms:WindowsLinuxOSX
Stars83
Updated1 month ago
LicenseUnknown
Release2015
Genre: Simulation
Theme: —
Active
Original game image
Original game imageClone of Pilotwings 64
A work-in-progress matching decompilation of Pilotwings 64 for the North America release; bring your own ROM.
Stars77
Updated1 month ago
LicenseMIT
Release2025
Genre: Simulation
Theme: —
Halted
Original game image
Original game imageClone of Star Fighter
The recovered 1995 3DO port source for Star Fighter, released in 2024, differing in several ways from the Acorn original.
Active
Clone of Black & White
A work-in-progress decompilation of Lionhead's Black & White (2001) covering Windows v1.00 to v1.20.
Stars74
Updated1 month ago
LicenseCC0-1.0
Release2022
Genre: Simulation
Theme: Fantasy
Active
Original game image
Original game imageClone of Ace Combat 5: The Unsung War
A static recompilation of Ace Combat 5 (PS2, NTSC-U) for Windows with a native Vulkan renderer; your own copy is required.
Stars67
Updated1 month ago
LicenseApache-2.0
Release2026
Genre: Simulation
Theme: —
Halted
Clone of Railroad Tycoon
FreeRails is a real-time, multiplayer railway strategy game based on Railroad Tycoon, written in Java, still unfinished.
ActiveOriginal game image
Original game imageClone of Pilotwings 64
A native Windows and Linux port of Pilotwings 64 made by static recompilation, with widescreen and high frame rate.
Stars67
Updated1 month ago
LicenseUnknown
Release2026
Genre: Simulation
Theme: —
Archived
Original game image
Original game imageClone of Star Raiders
A hand-typed transcription of the original Atari 800 Star Raiders source code, made from scanned printed listings.
ActiveOriginal game image
Original game imageClone of Animal Crossing
A native port of the Animal Crossing decompilation to Anbernic H700 handhelds, running on muOS and Knulli.
Stars60
Updated2 months ago
LicenseUnknown
Release2026
Genre: Simulation
Theme: —
Active
Active
Clone of Aviator
This is a fully documented disassembly of Aviator's original 6502 machine code, hand-reconstructed and annotated by Mark Moxon.
Halted
Original game image
Original game imageClone of Line Rider
An open-source spiritual successor to Line Rider 6.2, keeping its physics compatible while adding new features, built as a C#/.NET app.
Halted
Original game image
Original game imageClone of Airline Tycoon
Completes the partial Airline Tycoon Deluxe source code GOG bundled as a bonus; the singleplayer game is fully playable.
Active
Clone of Elite
Source code for the disc version of Elite on the BBC Micro, reconstructed from a disassembly and documented line-by-line by Mark Moxon.
Archived
Original game image
Original game imageClone of The Sims 2
A discontinued Unity reimplementation of The Sims 2, with only neighborhood select/view working; succeeded by OpenTS2.
Active
Clone of Animal Crossing
afe-decomp is a work-in-progress decompilation of the GameCube game Dōbutsu no Mori e+, tracked on a public match-percentage dashboard.
Halted
Clone of SimCity
Divercity is a Java extension of MicropolisJ (the Micropolis/SimCity port) built by nine students during a 2014 course in Berlin.
Halted
Original game image
Original game imageClone of Spacebase DF-9
A community-maintained Lua fork of Double Fine's Spacebase DF-9, patched from 2015 through a final 2023 release.
Halted
Active
Clone of Elifoot 98
Elifoot 98 Online runs the original DOS game in-browser via js-dos virtualization as a non-profit fan preservation project.
Active
Clone of Strike Commander
libRealSpace is a cross-platform reimplementation of Origin Systems' RealSpace engine, also used by Strike Commander.
Platforms:WindowsLinuxOSX
Stars45
Updated1 month ago
LicenseUnknown
Release2022
Genre: Action
Theme: Modern Military
Sporadic
Original game image
Original game imageClone of Harvest Moon: Friends of Mineral Town
It builds the ROM fomt.gba, and contributions are welcome.
Stars43
Updated9 months ago
LicenseUnknown
Release2022
Genre: Simulation
Theme: —
Active
Original game image
Original game imageClone of SimCopter
A ground-up Unreal Engine 5 reimplementation of Maxis's 1996 SimCopter with widescreen and SimCity 2000 city import.
Stars43
Updated2 months ago
LicenseUnknown
Release2026
Genre: Simulation
Theme: —