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 Star Wars: X-Wing vs. TIE Fighter
An open-source reimplementation of X-Wing vs. TIE Fighter with Balance of Power for Windows, macOS and Linux; needs the original game.
Stars43
Updated1 month ago
LicenseGPL-3.0
Release2026
Genre: Simulation
Theme: —
Active
Clone of Elite
This is the annotated original 6502 assembly source for the Apple II version of Elite, assembling into five byte-accurate variants.
Active
Clone of Dungeon Keeper 2
GLKeeper (GrimLands Keeper) is an early-development, open-source reimplementation of Dungeon Keeper 2 for Windows, not yet playable.
Active
Clone of Elite
The original 1985 BBC Micro assembly source for Elite, documented by Mark Moxon and buildable into byte-accurate historical discs.
Sporadic
Original game image
Original game imageClone of Jurassic Park: Operation Genesis
OpenJPOG, a decompilation of the Toshi engine 1.0 and the game Jurassic Park: Operation Genesis.
Stars39
Updated9 months ago
LicenseUnknown
Release2023
Genre: Simulation
Theme: —
Halted
Clone of MechWarrior
Platforms:WindowsLinux
Stars38
Updated3 years ago
LicenseApache-2.0
Release2012
Genre: Simulation
Theme: Sci-Fi
Halted
Original game image
Original game imageClone of SimCity
A Java version of Micropolis, the open-source release of SimCity, runnable with Java 7 or newer.
Active
Clone of Revs
A hand-reconstructed, byte-verified disassembly of Revs for BBC Micro, rebuilding all original variants plus a new Nurburgring track.
Archived
Active
Clone of Zoo Tycoon
A Rust enhancement DLL for Zoo Tycoon (2001) that adds Lua scripting, mod support and bug fixes.
Platforms:Windows
Stars34
Updated1 month ago
LicenseGPL-3.0
Release2022
Genre: Simulation
Theme: Management
Active
Clone of Elite
A fully documented, hand-reconstructed disassembly of Elite for the Acorn Electron, buildable into disc or tape images.
Active
Clone of Elite
Ian Bell and David Braben's 1986 Acornsoft Elite source for the BBC Master, hand-reconstructed and documented by Mark Moxon.
Halted
Clone of Super Star Trek
Faithful Perl and Lua ports of the 1978 BASIC-published Super Star Trek game by Mike Mayfield and Bob Leedom.
Active
Halted
Active
Original game image
Original game imageClone of Harvest Moon 64
An Android port of the Harvest Moon 64 static recompilation, with touch controls and a second-screen dashboard.
Stars29
Updated3 months ago
LicenseGPL-3.0
Release2026
Genre: Simulation
Theme: —
Halted
Clone of SimCopter
An early-stage open-source remake attempt of SimCopter; currently only terrain loading and rendering work.
Active
Clone of Dungeon Keeper
An actively developed fork of OpenDungeons, the Dungeon Keeper-inspired open-source dungeon-building RTS.
Platforms:WindowsLinux
Stars28
Updated2 months ago
LicenseUnknown
Release2014
Genre: Simulation
Theme: Horror
Halted
Clone of Lunar Lander
Pyxel Lander is a Lunar Lander tribute built with the Pyxel engine, featuring procedural maps and a fuel HUD.
Halted
Active
Halted
Original game image
Original game imageClone of Harvest Moon: A Wonderful Life
A work-in-progress disassembly/decompilation of the US GameCube version of Harvest Moon: A Wonderful Life.
Stars24
Updated4 years ago
LicenseUnknown
Release2021
Genre: Simulation
Theme: —
Active
Clone of Elite
A documented hack of BBC Micro Elite that converts its graphics to the console's teletext Mode 7 display.
Halted
Original game image
Original game imageClone of Enemy Engaged
The official public source-code release for the combat flight simulator Enemy Engaged: Comanche vs Hokum, targeting Windows.
Platforms:Windows
Stars23
Updated5 years ago
LicenseUnknown
Release2018
Genre: Simulation
Theme: Modern Military
Halted
Halted
Original game image
Original game imageClone of Star Trek
A Python port of a C# rewrite of the original 1971 text-based Star Trek game.
Sporadic
Original game image
Original game imageClone of The Sims 2
An early-stage matching decompilation of The Sims 2 for GameCube, with 12.40% of game code clean byte-matched.
Stars20
Updated5 months ago
LicenseUnknown
Release2026
Genre: Simulation
Theme: —
Halted
Original game image
Original game imageHalted
Clone of Football Manager
The original 1982 BASIC source code for the ZX81 version of Kevin Toms's Football Manager, the series' first, text-based game.
Platforms:TRS-80
Stars19
Updated5 years ago
LicenseUnknown
Release2021
Genre: Simulation
Theme: Management
HaltedOriginal game image
Original game imageClone of Ironseed
A Free Pascal port of Iron Seed's original released source code, letting it compile and run natively on GNU/Linux, with ongoing bug fixes.
Active
Clone of Starsiege
A file-format viewer/converter for reverse-engineered Dynamix game data (Earthsiege, Starsiege, Tribes, Red Baron and more).
Halted
Archived
Original game image
Original game imageClone of Allegiance
Microsoft's official, unsupported source-code release for Allegiance, published as-is after the game's own servers had already shut down.
Halted
Sporadic
Clone of The Sims 2: Castaway
A work-in-progress decompilation of The Sims 2: Castaway, supporting the PAL Rev 1 version.
Stars16
Updated9 months ago
LicenseCC0-1.0
Release2025
Genre: Simulation
Theme: —
Halted
Clone of Lunar Lander
Lander is a Lunar Lander-style game for Linux and Windows, steering a ship through randomly generated, increasingly hard levels.
Platforms:WindowsLinuxOSX
Stars15
Updated3 years ago
LicenseGPL-3.0
Release2012
Genre: Simulation
Theme: —
Halted
Clone of Escape Velocity
A Naev fork set in a declining galactic empire, in the vein of Escape Velocity, with a mostly random galaxy to explore.
Platforms:WindowsLinuxOSX
Stars15
Updated9 years ago
LicenseGPL-3.0
Release2016
Genre: Action
Theme: —
Halted
Original game image
Original game imageClone of The Sims Online
Open source encoder/decoder tools for EA's MicroTalk speech codec, used in games like SimCity 4 and The Sims Online.
Platforms:None
Stars15
Updated8 years ago
LicenseUnlicense
Release2015
Genre: Simulation
Theme: Management
Halted
Original game image
Original game imageClone of FreeSpace 2
An Android port of Freespace 2, which the project calls an old 3D space simulator game.
Stars14
Updated10 years ago
LicenseUnknown
Release2016
Genre: Action
Theme: Sci-Fi