Free & Open Source Simulation Games
221 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.
Sporadic
Halted
Halted
Clone of Cart Life
Richard Hofmeier's original Cart Life source code, released free after leaving Steam, built with Adventure Game Studio.
Halted
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
Updated14 days ago
LicenseUnknown
Release2022
Genre: Strategy
Theme: Management
Halted
Clone of Elite II
GLFrontier reimplements the Atari ST game Frontier, built on reverse-engineered code plus parts from the Hatari emulator.
Sporadic
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
Updated11 days ago
LicenseUnknown
Release2015
Genre: Simulation
Theme: —
Halted
Halted
Clone of Railroad Tycoon
FreeRails is a real-time, multiplayer railway strategy game based on Railroad Tycoon, written in Java, still unfinished.
Archived
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
Halted
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
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
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
Updated13 days ago
LicenseUnknown
Release2022
Genre: Action
Theme: Modern Military
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
Active
Clone of Elite
The original 1985 BBC Micro assembly source for Elite, documented by Mark Moxon and buildable into byte-accurate historical discs.
Halted
Clone of MechWarrior
Platforms:WindowsLinux
Stars38
Updated3 years ago
LicenseApache-2.0
Release2012
Genre: Simulation
Theme: Sci-Fi
Halted
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
Updated11 days 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
Halted
Clone of SimCopter
An early-stage open-source remake attempt of SimCopter; currently only terrain loading and rendering work.