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
Clone of The Sims
A C# Windows frontend for The Sims, built on FreeSO, adding 3D visuals and a modern UI to the original 2D game.
Platforms:Windows
Stars492
Updated11 months ago
LicenseUnknown
Release2017
Genre: Simulation
Theme: Management
Active
Clone of Elite
The cassette version of Ian Bell and David Braben's 1984 Elite source code, reformatted and documented by Mark Moxon, not reconstructed.
Active
Clone of FreeSpace 2
FS2 Open, the FreeSpace 2 Source Code Project, is an open-source build of FreeSpace 2 targeting Windows, Linux, and macOS.
Platforms:WindowsLinuxOSX
Stars487
Updated11 days ago
LicenseUnknown
Release2013
Genre: Action
Theme: Sci-Fi
Active
Clone of Elite
The fully documented original Commodore 64 source code for Elite (1985), annotated line-by-line and built into four accurate variants.
Active
Clone of Lunar Lander
An open-source programming language whose example programs include recreations of classic games like Pac-Man and Tetris.
Active
Clone of The Sims 2
An early Unity-based re-implementation of The Sims 2, with a working main menu and basic neighborhood view.
Active
Active
Clone of BVE Trainsim
An open-source 3D cab-view train simulator that runs BVE, BVE5 and Mechanik routes and BVE trains.
Platforms:WindowsLinuxOSX
Stars377
Updated13 days ago
LicenseUnknown
Release2015
Genre: Simulation
Theme: —
Active
Clone of Elite
An open-source space trading and combat simulator with entirely original assets, inspired by the classic game Elite.
Active
Halted
Clone of RimWorld
A Unity tutorial project and base-building game skeleton inspired by Dwarf Fortress and RimWorld.
Platforms:WindowsLinuxOSX
Stars325
Updated1 year ago
LicenseGPL-3.0
Release2017
Genre: Simulation
Theme: Sci-Fi
Active
Clone of The Sims
An open-source engine recreation of The Sims 1 with expanded gameplay, requiring the original game's files to run.
Platforms:WindowsLinux
Stars319
Updated20 days ago
LicenseUnknown
Release2015
Genre: Simulation
Theme: Management
Halted
Active
Halted
Clone of Story of Seasons series
A farming-sim clone built in Godot with crops, town trading, and a day cycle, though some interior areas remain inaccessible.
Platforms:WindowsLinuxOSX
Stars293
Updated6 years ago
LicenseMIT
Release2019
Genre: Simulation
Theme: Anime
Halted
Active
Clone of Space Station 13
An open-source, pre-alpha 3D revival of Space Station 13, built in Unity and expanding *beep's original SS3D demo.
Sporadic
Active
Clone of RollerCoaster Tycoon
A C++17 recreation aiming to capture the look, feel, and gameplay of RollerCoaster Tycoon 1 and 2, semi-playable in-browser via WebAssembly.
Platforms:WebWindowsLinux
Stars255
Updated13 days ago
LicenseUnknown
Release2015
Genre: Simulation
Theme: Management
Halted
Halted
Clone of RimWorld
A RimWorld mod distributed as a Harmony-patched DLL, with separate builds maintained for each RimWorld version.
Platforms:WindowsLinuxOSX
Stars249
Updated1 year ago
LicenseMIT
Release2016
Genre: Simulation
Theme: Sci-Fi
Active
Clone of Buzz Aldrin's Race Into Space
Race Into Space is the actively maintained free-software continuation of Buzz Aldrin's 1993 Race Into Space.
Platforms:WindowsLinuxOSX
Stars228
Updated12 days ago
LicenseGPL-2.0
Release2011
Genre: Strategy
Theme: Management
Active
Sporadic
Clone of SimCity
A SimCity-inspired city simulation for the Raspberry Pi RP2040, inspired by the Arduboy game MicroCity.
Halted
Clone of Elifoot 98
EliFUT is an open-source Android football-manager game inspired by Elifoot 98, using FIFA 15 data and free on Google Play.
Platforms:Android
Stars189
Updated6 years ago
LicenseApache-2.0
Release2015
Genre: Sports
Theme: Management
Halted
Active
Halted
Clone of Ace Combat: Assault Horizon
An open-source reimplementation of Ace Combat: Assault Horizon's rendering and physics, without Dog Fight Mode.
Platforms:WindowsLinuxOSX
Stars175
Updated4 years ago
LicenseMIT
Release2014
Genre: Action
Theme: Modern Military
Sporadic
Clone of Creatures
An open-source engine for the Creatures artificial life games; it needs the original data files and is still in progress.
Platforms:WindowsLinuxOSX
Stars166
Updated4 months ago
LicenseLGPL-2.1
Release2020
Genre: Simulation
Theme: —
Halted
Clone of King under the Mountain
A Java game built with LibGDX, originally developed by Rocket Jump Technology and released open source under the MIT license.
Halted
Active
Clone of Theme Park World
An early, not-yet-playable re-implementation of Theme Park World that uses the original game's assets.
Halted
Clone of Elite
A Windows remake of Elite built with Allegro and DirectX, reaching Release 1.0 on 22 July 2001 after several betas.
Active
Clone of Outpost
A C++ redesign of Sierra's 1994 colony game Outpost, keeping its core concepts in a more responsive game.
Platforms:Windows
Stars143
Updated1 month ago
LicenseBSD-3-Clause
Release2018
Genre: Simulation
Theme: Sci-Fi
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
Active
Clone of Mad TV
TVTower is a free, open-source tribute to the 1991 TV-station management game Mad TV.
Platforms:Windows
Stars136
Updated13 days ago
LicenseUnknown
Release2014
Genre: Strategy
Theme: Management
Sporadic
Halted