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 SimCity
3d.city renders a live city simulation in full 3D via WebGL2 or WebGPU in the browser, using Three.js and the micropolisJS engine.
Active
Clone of Factorio
An open-source automation tower defense RTS in Java, for desktop, Android and iOS.
Platforms:WindowsLinuxOSX
Stars28,996
Updated11 days ago
LicenseGPL-3.0
Release2017
Genre: Simulation
Theme: —
Active
Clone of RollerCoaster Tycoon
An open-source re-implementation of RollerCoaster Tycoon 2 with modern platform support, higher limits and co-op multiplayer.
Platforms:WindowsLinuxOSX
Stars16,227
Updated11 days ago
LicenseGPL-3.0
Release2014
Genre: Simulation
Theme: Management
Active
Clone of Transport Tycoon
A free, actively developed remake and expansion of Transport Tycoon Deluxe with multiplayer and in-game mod downloads.
Platforms:WindowsLinuxOSX
Stars8,264
Updated11 days ago
LicenseUnknown
Release2018
Genre: Strategy
Theme: Management
Halted
Active
Clone of Escape Velocity
Endless Sky is a sandbox 2D space trading and combat game inspired by Elite and Escape Velocity, developed for a decade by volunteers.
Platforms:WindowsLinuxOSX
Stars7,559
Updated11 days ago
LicenseGPL-3.0
Release2015
Genre: Action
Theme: —
Active
Clone of Powder Game
A free, open-source 2D physics sandbox simulating pressure, heat, gravity, and countless material interactions.
Platforms:WindowsLinuxOSX
Stars5,314
Updated17 days ago
LicenseGPL-3.0
Release2010
Genre: Simulation
Theme: —
Halted
Clone of SimCity 2000
An unfinished browser-based SimCity 2000 remake in JavaScript and Phaser 3 that can import and view cities but not simulate them.
Active
Clone of Theme Hospital
CorsixTH is a reimplementation of Theme Hospital for modern systems, adding 4K support, a map editor, and 20+ language translations.
Platforms:WindowsLinuxOSX
Stars4,558
Updated11 days ago
LicenseUnknown
Release2013
Genre: Strategy
Theme: Management
Active
Clone of Space Station 13
An open-source remake of SS13 built on a custom C# engine, with heavily moddable community servers.
Active
Clone of Spore
An open-source evolution sim where you guide a species from a single cell through mutation-driven natural selection.
Platforms:Windows
Stars3,706
Updated11 days ago
LicenseUnknown
Release2012
Genre: Simulation
Theme: Sci-Fi
Active
Clone of Caesar III
Julius is an open-source reimplementation of Caesar III reproducing the original's logic and save compatibility, with widescreen support.
Platforms:WebWindowsLinux
Stars3,375
Updated14 days ago
LicenseAGPL-3.0
Release2017
Genre: Simulation
Theme: Management
Active
Clone of Powder Game
A browser-playable falling-sand simulation in Rust/WebAssembly and WebGL, letting players create, share, and fork creations.
Archived
Active
Clone of Jones in the Fast Lane
An open-source engine reimplementation that lets classic point-and-click adventures and RPGs run on modern platforms.
Platforms:WindowsLinuxOSX
Stars2,811
Updated11 days ago
LicenseGPL-3.0
Release2011
Genre: Simulation
Theme: —
Active
Active
Clone of Caesar III
A fork of the Julius Caesar III re-implementation adding new customizable gameplay, actively developed for Windows, Linux, macOS, and more.
Platforms:Web
Stars2,082
Updated13 days ago
LicenseAGPL-3.0
Release2020
Genre: Simulation
Theme: Management
Active
Active
Clone of Chris Sawyer's Locomotion
A complete C++ re-implementation of Chris Sawyer's Locomotion, aiming to improve it the way OpenTTD improved Transport Tycoon.
Platforms:WindowsLinuxOSX
Stars1,904
Updated12 days ago
LicenseMIT
Release2018
Genre: Strategy
Theme: Management
Active
Clone of Black & White
An open-source C++ reimplementation of Lionhead's Black & White that runs on the original game's assets.
Platforms:WebWindowsLinux
Stars1,560
Updated1 month ago
LicenseGPL-3.0
Release2018
Genre: Simulation
Theme: Fantasy
Active
Clone of Tabletop Simulator
An open-source, physics-driven 3D tabletop sandbox built with Godot, with free online multiplayer and no sign-up.
Platforms:WindowsLinuxOSX
Stars1,456
Updated27 days ago
LicenseMIT
Release2020
Genre: simulation video game
Theme: —
Active
Active
Clone of BeamNG.drive
An open-source soft-body vehicle physics sandbox with online multiplayer, simulating cars, trucks, boats, and aircraft.
Platforms:WindowsLinux
Stars1,245
Updated29 days ago
LicenseGPL-3.0
Release2014
Genre: Simulation
Theme: —
Sporadic
Active
Clone of Dungeon Keeper
KeeperFX is an open-source expansion and remake of Dungeon Keeper for modern Windows, requiring the player's own original game files.
Active
Clone of The Sims Online
FreeSO is a MonoGame reimplementation of The Sims Online, now serving mainly as an engine base for other TSO servers.
Platforms:Windows
Stars976
Updated13 days ago
LicenseMPL-2.0
Release2015
Genre: Simulation
Theme: Management
Archived
Clone of Sea Dogs: To Each His Own
The open-source engine behind the Sea Dogs, Pirates of the Caribbean, and Age of Pirates games, now archived and community-maintained.
Platforms:Windows
Stars898
Updated2 years ago
LicenseGPL-3.0
Release2020
Genre: Action
Theme: —
Active
Clone of Artemis: Spaceship Bridge Simulator
EmptyEpsilon is an open-source game that began as an Artemis Spaceship Bridge Simulator clone but has since diverged with new features.
Platforms:WindowsLinuxAndroid
Stars869
Updated1 month ago
LicenseGPL-2.0
Release2014
Genre: Simulation
Theme: Sci-Fi
Active
Clone of Artemis: Spaceship Bridge Simulator
An open-source, Artemis-inspired multiplayer spaceship bridge simulator for Linux with Lua-scripted missions.
Active
Clone of Space Station 13
A free multiplayer RPG remake of the cult-classic Space Station 13, rebuilt outside the original BYOND engine.
Halted
Active
Active
Clone of SimCity
A modernized continuation of classic LinCity, a city-building sim where you build a sustainable city or evacuate everyone by spaceship.
Platforms:WindowsLinux
Stars632
Updated11 days ago
LicenseGPL-2.0
Release2015
Genre: Simulation
Theme: Management
Active
Clone of Freelancer
A C# and OpenGL reimplementation of Freelancer for Windows and Linux, requiring an existing Freelancer installation to run.
Halted
Clone of SimTower
An unfinished, unplayable open-source C++ remake of SimTower that needs the original game's SIMTOWER.EXE to run.
Platforms:WindowsLinuxOSX
Stars591
Updated7 years ago
LicenseGPL-2.0
Release2010
Genre: Simulation
Theme: Management
Halted
Clone of 北京浮生记
The official source code (version 1.2.2) for Beijing Fushengji, originally compiled with Visual C++ 6.0 on Windows XP.
Sporadic
Clone of Dungeon Keeper
An open-source dungeon-building RTS inspired by Dungeon Keeper, now mostly archived in favour of the OpenDungeonsPlus fork.
Platforms:WindowsLinux
Stars503
Updated11 months ago
LicenseUnknown
Release2014
Genre: Simulation
Theme: Horror
Active
Active
Clone of Pharaoh
A reimplementation of the Pharaoh game engine for modern systems, forked from the Julius/Augustus project and retargeted at Pharaoh.
Platforms:WebWindowsLinux
Stars496
Updated12 days ago
LicenseAGPL-3.0
Release2023
Genre: Simulation
Theme: Ancient History