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.

Active

OpenDungeonsPlus

Clone of Dungeon Keeper

An actively developed fork of OpenDungeons, the Dungeon Keeper-inspired open-source dungeon-building RTS.

Platforms:WindowsLinux

Stars28

Updated21 days ago

LicenseUnknown

Release2014

Genre: Simulation

Theme: Horror

Halted

Pyxel Lander

Clone of Lunar Lander

Pyxel Lander is a Lunar Lander tribute built with the Pyxel engine, featuring procedural maps and a fuel HUD.

Platforms:WindowsLinuxOSX

Stars27

Updated3 years ago

LicenseMIT

Release2018

Genre: Simulation

Theme: —

Halted

Der Clou!

Clone of The Clue!

An SDL-based port of Der Clou!, a burglary simulation game originally made by neo Software Produktions GmbH.

Platforms:Linux

Stars24

Updated4 years ago

LicenseUnknown

Release2012

Genre: Adventure

Theme: —

Active

Elite Universe Editor

Clone of Elite

A tool for creating custom universes for classic BBC Micro and Commodore 64 Elite, supporting three original hardware platforms.

Platforms:WebBBC MicroC64

Stars24

Updated18 days ago

LicenseUnknown

Release2022

Genre: Action

Theme: Sci-Fi

Active

Teletext Elite

Clone of Elite

A documented hack of BBC Micro Elite that converts its graphics to the console's teletext Mode 7 display.

Platforms:BBC Micro

Stars23

Updated17 days ago

LicenseUnknown

Release2022

Genre: Action

Theme: Sci-Fi

Halted

No preview

eech_source_code

Clone 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

No preview

Honey Town

Clone of Story of Seasons series

An open-source farming RPG engine in C#/MonoGame with tools, crops, a day/season cycle, and partial livestock support; more is planned.

Platforms:WindowsLinuxOSX

Stars21

Updated3 years ago

LicenseGPL-3.0

Release2019

Genre: Simulation

Theme: Anime

Halted

No preview

Star Trek 1971 for Python

Clone of Star Trek

A Python port of a C# rewrite of the original 1971 text-based Star Trek game.

Platforms:None

Stars20

Updated3 years ago

LicenseMIT

Release2014

Genre: Simulation

Theme: Sci-Fi

Halted

No preview

Ironseed

Clone of Ironseed

Platforms:DOS

Stars19

Updated13 years ago

LicenseGPL-3.0

Release2013

Genre: Simulation

Theme: Sci-Fi

Halted

Kevin Toms Football Manager

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

Updated4 years ago

LicenseUnknown

Release2021

Genre: Simulation

Theme: Management

Halted

No preview

ironseed_fpc

Clone 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.

Platforms:Linux

Stars19

Updated2 years ago

LicenseGPL-3.0

Release2020

Genre: Simulation

Theme: Sci-Fi

Active

Siege Studio

Clone of Starsiege

A file-format viewer/converter for reverse-engineered Dynamix game data (Earthsiege, Starsiege, Tribes, Red Baron and more).

Platforms:Windows

Stars18

Updated1 month ago

LicenseMIT

Release2019

Genre: Simulation

Theme: Sci-Fi

Halted

No preview

Corncob 3D

Clone of Corncob 3D

Preserves the source code of Corncob 3D, a 1992 DOS game whose developer said it could be used freely.

Platforms:DOS

Stars17

Updated8 years ago

LicenseUnknown

Release2018

Genre: Simulation

Theme: Sci-Fi

Archived

No preview

Allegiance

Clone of Allegiance

Microsoft's official, unsupported source-code release for Allegiance, published as-is after the game's own servers had already shut down.

Platforms:Windows

Stars16

Updated9 years ago

LicenseUnknown

Release2017

Genre: Action

Theme: Sci-Fi

Halted

No preview

Olympia: The Age of Gods PBEM

Clone of Olympia PBEM

Source code of Olympia: The Age of Gods, Scott Turner's expanded version of Rich Skrenta's play-by-email strategy game.

Platforms:None

Stars16

Updated3 years ago

LicenseBSD-3-Clause

Release2011

Genre: Turn-Based Strategy

Theme: Fantasy

Halted

Lunar Lander

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

Nox Imperii

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

No preview

utkencode

Clone 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

No preview

Atari8bit_StarRaiders

Clone of Star Raiders

A disassembly of Star Raiders' original 6502 assembly source, not a reimplementation; a work in progress and not yet playable.

Platforms:Atari

Stars13

Updated12 years ago

LicenseUnknown

Release2013

Genre: Action

Theme: Sci-Fi

Halted

Planet Lander

Clone of Lunar Lander

A Python/Pygame Lunar Lander clone with procedural terrain, demo mode, and a built-in AI autopilot.

Platforms:None

Stars13

Updated6 years ago

LicenseMIT

Release2019

Genre: Simulation

Theme: —

Halted

No preview

Football Manager

Clone of Football Manager

Platforms:None

Stars12

Updated12 years ago

LicenseGPL2*

Release2014

Genre: Simulation

Theme: Management

Halted

No preview

BOB_Src

Clone of Rowan's Battle of Britain

The source code for Rowan's Battle of Britain, per its minimal README with no further build or gameplay details given.

Platforms:Windows

Stars11

Updated11 years ago

LicenseUnknown

Release2015

Genre: Simulation

Theme: —

Halted

TTDPatch

Clone of Transport Tycoon

Platforms:WindowsDOS

Stars11

Updated8 years ago

LicenseGPL-2.0

Release2017

Genre: Strategy

Theme: Management

Halted

starshatter-open

Clone of Starshatter

The Starshatter space combat simulator's source code, migrated from Google Code and released under a BSD license.

Platforms:Windows

Stars8

Updated11 years ago

LicenseUnknown

Release2015

Genre: Simulation

Theme: Sci-Fi

Sporadic

SuperStarTrek25thGMS

Clone of Super Star Trek

A Game Maker Studio remake of the Adventure Game Studio fan game Super Star Trek Meets 25th Anniversary.

Platforms:Android

Stars7

Updated5 months ago

LicenseUnknown

Release2025

Genre: Simulation

Theme: Sci-Fi

Halted

No preview

TINY TREK

Clone of Tiny Trek

A remake of Tiny Trek for the Playdate handheld, played using the device's crank and A/B buttons.

Platforms:Playdate

Stars7

Updated3 years ago

LicenseUnknown

Release2022

Genre: Simulation

Theme: Sci-Fi

Halted

No preview

flightsim

Clone of Tornado

The official 1993 DOS source for Digital Integration's Tornado flight simulator, backend only — no C/C++ frontend menu code.

Platforms:DOS

Stars7

Updated9 years ago

LicenseUnknown

Release2017

Genre: Flight

Theme: —

Sporadic

No preview

Minecraft-4K-Decompilation

Clone of Minecraft 4k

A decompilation of Minecraft 4K, turned from a Java applet into a standalone application.

Platforms:None

Stars6

Updated5 months ago

LicenseUnknown

Release2020

Genre: Simulation

Theme: —

Sporadic

No preview

Ozymandias

Clone of Pharaoh

An early Godot 3.6 project to recreate the engine of Impressions Games' city builders like Pharaoh and Zeus.

Platforms:WindowsLinuxOSX

Stars6

Updated7 months ago

LicenseUnknown

Release2026

Genre: Simulation

Theme: Ancient History

Halted

SimCity (SNES) Disassembly

Clone of SimCity

A disassembly of the USA SNES SimCity ROM, built on the author's own SNES ROM framework for asset extraction.

Platforms:SNES

Stars6

Updated5 years ago

LicenseGPL-3.0

Release2021

Genre: Simulation

Theme: Management

Sporadic

No preview

TriSpace

Clone of Elite

An Elite-like space game for the FunKey S handheld, with procedurally generated star systems, combat, and ship upgrades.

Platforms:Linux

Stars6

Updated8 months ago

LicenseAGPL-3.0

Release2021

Genre: Action

Theme: Sci-Fi

Halted

No preview

openStrato

Clone of Stratosphere: Conquest of the Skies

A planned, unplayable 2D/2.5D remake of Stratosphere: Conquest of the Skies about building and flying a spaceship.

Platforms:Web

Stars6

Updated11 years ago

LicenseGPL-2.0

Release2014

Genre: Simulation

Theme: —

Halted

No preview

BeijingFuShengJi-Godot

Clone of 北京浮生记

An early-access Godot remake of the classic game Beijing Fushengji, made by a different developer, still missing some icons and sounds.

Platforms:Windows

Stars4

Updated1 year ago

LicenseGPL-2.0

Release2023

Genre: RPG

Theme: —

Halted

FFED3D

Clone of Elite III

Platforms:Windows

Stars3

Updated10 years ago

LicenseUnknown

Release2016

Genre: Action

Theme: Sci-Fi

Halted

Fly8

Clone of Fly8

Source code for Eyal Lebedinsky's 1998 flight simulator Fly8, with build support across DOS, Unix/X11, Amiga, OS/2, and Windows.

Platforms:WindowsLinuxDOS

Stars3

Updated6 years ago

LicenseUnknown

Release2020

Genre: Flight

Theme: —

Halted

Moonlander

Clone of Moonlander

An iOS remake of Moonlander, the 1973 game for the DEC GT40 terminal.

Platforms:iOS

Stars3

Updated5 years ago

LicenseMIT

Release2020

Genre: Simulation

Theme: —

Halted

W.R. Hutsell's Civil War Strategy Game

Clone of Civil War Strategy

A turn-based Civil War strategy wargame by W.R. Hutsell, with its original source preserved and a QB64-ported branch.

Platforms:Windows

Stars3

Updated1 year ago

LicenseMIT

Release2021

Genre: Simulation

Theme: Civil War

Sporadic

No preview

Uplink

Clone of Uplink

Platforms:Linux

Stars2

Updated6 months ago

LicenseMIT

Release2025

Genre: Simulation

Theme: —

Halted

W.R. Hutsell's Civil War Battleset

Clone of Civil War Battleset

The preserved original DOS source code for W.R. Hutsell's tactical Civil War wargame, kept unedited for history.

Platforms:DOS

Stars2

Updated1 year ago

LicenseMIT

Release2021

Genre: Simulation

Theme: Civil War

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