Hypersomnia

Competitive top-down shooter with extreme dynamics and pixely nostalgia. Comes with a built-in map Editor. [source]

Dead Ascend

A zombie adventure, escape room, with twists. [source]

Endless Sky

Space exploration, trading, and combat game. [source]

Pioneer

A space adventure game set in our galaxy at the turn of the 33rd century. [source]

ScummVM

A program which allows you to run certain classic graphical adventure and role-playing games. [source]

The Legend of Zelda: Twilight Princess

A reverse engineering project to decompile Twilight Princess into human-readable and modifiable source code. [source]

CorsixTH

Open source clone of Theme Hospital. [source]

Hurry Curry!

Cooperative fast-paced multiplayer cooking game. [source]

OpenLoco

An open source re-implementation of Chris Sawyer's Locomotion. [source]

OpenRCT2

An open-source re-implementation of RollerCoaster Tycoon 2. [source]

OpenTTD

An open source simulation game based upon Transport Tycoon Deluxe. [source]

Akhenaten

A strategic city-building game, based on assets and gameplay mechanics from Pharaoh + Cleopatra title, where players take on the role of a ruler and mayor of ancient Egyptian civilization. [source]

Citybound

A city building game that uses microscopic models to vividly simulate the organism of a city arising from the interactions of millions of individuals. [source]

Cytopia

A free, open source retro pixel-art city building game. [source]

IsoCity

Isometric city-building simulation game built with NextJS, TypeScript and TailwindCSS. [source]

micropolisJS

A handmade Javascript port of the open-source city simulator Micropolis. [source]

Unknown Horizons

A 2D realtime strategy simulation with an emphasis on economy and city building.; Original: [source] Engine: FIFE [source]; Godot port: [source] Engine: Godot [source]

.kkrieger

A first-person shooter video game created by German demogroup .theprodukkt (a former subdivision of Farbrausch), which won first place in the 96k game competition at Breakpoint in April 2004. [source]

Anarch

This isn't a 90s style retro shooter, this is a 90s shooter. [source]

AssaultCube

A FREE, multiplayer, first-person shooter game. [source] Engine: CUBE [source]

Cube 2: Sauerbraten

A free multiplayer & singleplayer first person shooter. [source] Engine: CUBE [source]

Descent 3

A first-person shooter video game/ [source]

Liblast

A Libre Multiplayer FPS Game built with Godot 4 engine and a fully open-source toolchain. [source] Engine: Godot [source]

Red Eclipse

An old-school arena shooter for the modern age. [source] Engine: CUBE [source]

The Dark Mod

First-person stealth video game. [source]

Xonotic

An addictive arena-style first person shooter with crisp movement and a wide array of weapons. [source]

Duke Nukem 3D

By 3D Realms Entertainment, Inc. [source]

EDuke32

The official EDuke32 Git repository: home to the source code to EDuke32, Ion Fury, VoidSW, Mapster32, and related projects based on the Build Engine.

JFDuke3D

Port of the 3D Realms game Duke Nukem 3D [source]

JFShadowWarrior

Port of the 3D Realms game Shadow Warrior.

NBlood

Reverse-engineered ports of Build games using EDuke32 engine technology and development principles (NBlood/Rednukem/PCExhume d) [source]

Raze

Build engine port backed by GZDoom tech. Currently supports Duke Nukem 3D, Blood, Shadow Warrior, Redneck Rampage and Powerslave/Exhumed.

Doom

[source]

Doom 3

BFG Edition - [source]

Quake

[source]

Quake II

[source]

Quake III Arena

[source]

Wolfenstein 3D

[source]

Catacomb 3-D

CatacombGL - A source port of Catacomb 3D and the Catacomb Adventure series. [source]

Chocolate Doom

A Doom source port that accurately reproduces the experience of Doom as it was played in the 1990s. [source]

ZDoom

A feature centric port for all Doom engine games. [source]

FTEQW

Powerful engine for playing and modding idTech based games. [source]

Commander Keen

Commander-Genius - An open-source interpreter for the Commander Keen (1-6, Dreams) and Cosmo's Cosmic series which allows you to play the original episodes and some of the mods made for them. [source]; Omnispeak - An open-source re-implementation of Commander Keen in Goodbye Galaxy. [source]

Commander Keen in Keen Dreams

A side-scrolling platform video game developed by id Software. [source]

DDraceNetwork

Cooperative 2D online platformer. [source]

Fish Folk

Games

Jumpy

A tactical 2D shooter. [source] Engine: Bevy [source]

Punchy

A 2.5D side-scroller beatemup, made in Bevy. Engine: Bevy [source]

Frogatto & Friends

An action-adventure platformer game, starring a certain quixotic frog. [source] Engine: Anura [source]

OpenGOAL

This project is to port Jak & Daxter Series to PC. [source]

Sonic Robo Blast 2

A 3D open-source Sonic the Hedgehog fangame built on Doom. [source]

VVVVVV

[source]

BlockOut II

A free adaptation of the original BlockOut® DOS game edited by California Dreams in 1989. [source]

Whatajong

[source]

Dust Racing 2D

A traditional top-down car racing game including a level editor. [source]

ManiaDrive

A free clone of TrackMania, the great game from Nadéo studio. [source] Engine: Raydium [source]

Rigs of Rods

An open-source physics sandbox simulation game that can simulate the motion and deformation of vehicles in real time. [source] Engine: OGRE [source] UI: Dear ImGui [source]

RVGL

A cross-platform rewrite / port of Re-Volt that runs natively on both Windows and GNU/Linux. [source]

Speed Dreams

A free and open source motorsport simulator. [source]

Stunt Rally

3D racing game with Sci-Fi elements and own Track Editor. [source]

SuperTuxKart

A free kart racing game. It focuses on fun and not on realistic kart physics. [source]

TORCS - The Open Racing Car Simulator

A highly portable multi platform car racing simulation. It is used as ordinary car racing game, as AI racing game and as research platform. [source]

Trigger Rally

A fast-paced single-player racing game for Linux and Windows. [source]

VDrift

A cross-platform, open source driving simulation made with drift racing in mind. [source]

Yorg

Yorg (Yorg's an Open Racing Game) is a free open source racing game developed by Ya2 using Panda3D for Windows, OSX and Linux. [source] Engine: Panda3D [source]

wipEout

This is a re-implementation of the 1995 PSX game Wipeout. [source]

0 A.D.

A free, open-source game of ancient warfare. [source]

BAR

Beyond All Reason. [source] Engine: Spring [source]

Dune II The Maker

A Dune 2 remake. [source]

Keeper FX

An open-source remake and fan expansion of Dungeon Keeper. [source]

Mindustry

A sandbox tower-defense game. [source]

OpenAge

A free (as in freedom) cross-platform RTS game engine that provides the mechanics of Age of Empires. [source]

OpenHV

An Open Source Pixelart Science-Fiction Real-Time-Strategy game. [source]

OpenRA

Command & Conquer, Dune 2000 and Red Alert rebuild for the Modern Era. [source]

Warzone 2100

A free, open source, 3D real-time strategy game with a story-driven single-player campaign, online multi-player, offline skirmish, and more. [source]

Widelands

A free, open source real-time strategy game. [source]

Zero-K

RTS game with physical projectiles, smart units and a powerful UI. [source] Engine: Spring [source]

Strategus

Engine Games [source]

War1gus

A re-implementation of Warcraft: Orcs & Humans that that can be played on modern platforms. [source]

Wyrmsun

A strategy game which features elements of mythology, history and fiction. [source]

Stargus

Importer and scripts for Starcraft. [source]

Red Alert

[source]

Tiberian Dawn

[source]

Brogue CE

Brogue is a minimalist, turn-based, procedurally-generated roguelike game where you descend a perilous dungeon to retrieve the Amulet of Yendor. [source]

Cataclysm: Dark Days Ahead

A turn-based survival game set in a post-apocalyptic world. [source]

Dungeon Crawl Stone Soup

An open source roguelike adventure through dungeons filled with dangerous monsters in a quest to find the mystifyingly fabulous Orb of Zot. [source]

NetHack

Single player dungeon exploration game. [source]

Meritous

An action-adventure dungeon crawl game. [source]

Shattered Pixel Dungeon

An open-source traditional roguelike dungeon crawler with randomized levels and enemies, and hundreds of items to collect and use. [source]

Ambermoon.net

A full C# rewrite of Ambermoon. [source]

Daggerfall Unity

An open source recreation of Daggerfall in the Unity engine. [source]

Exult

A project to recreate Ultima VII for modern operating systems. [source]

GemRB

A portable open-source implementation of Bioware’s Infinity Engine [source]

Baldur’s Gate

Baldur's Gate II: Shadows of Amn

Icewind Dale

Icewind Dale II

Planescape: Torment

Kandria

An action RPG made in Common Lisp. [source] Engine: Trial [source]

Naev

A 2d action/rpg space game that combines elements from the action, rpg and simulation genres. [source]

Oolite

An open-world space opera. [source]

OpenMW

A free, open source, and modern engine which re-implements and extends the 2002 Gamebryo engine for the open-world role-playing game The Elder Scrolls III: Morrowind. [source]

Severed Chains

The Legend of Dragoon decompiled, reverse engineered, and ported to PC/Mac/Linux/Steam Deck. [source]

Space Station 14

Open-source remake of Space Station 13. [source]

Ultima VII: Revisited

A replacement engine for Ultima VII that presents the game in 3D and fixes various issues with the game. [source]

Veloren

multiplayer voxel RPG written in Rust. [source]

DevilutionX

A port of Diablo and Hellfire that strives to make it simple to run the game while providing engine improvements, bugfixes, and some optional quality of life features. [source]

Freeablo

A work-in-progress free and open-source replacement for the Diablo I engine. [source]

SDL Sopwith

A port of the classic biplane shoot ‘em-up “Sopwith” to run on modern computers and operating systems. [source]

Taisei Project

A free and open-source fangame of the Tōhō series, written in C using SDL3 and OpenGL. [source]

Open Golf

A cross-platform minigolf game written in C. [source]

Pooltool

A sandbox billiards game that emphasizes realistic physics. [source]

Command & Conquer Renegade

[source]

Lugaru: The Rabbit's Foot

Cross-platform, open-source 3D action game. [source]

OpenLara

Classic Tomb Raider open-source engine. [source]

OpenRW

A Grand Theft Auto III re-implementation. [source]

Overgrowth

The sequel to Lugaru. [source]

Tomb Engine

An open-source engine for custom Tomb Raider adventures. Core Design era (1 - 5). [source]

Server Survival

Tower defense game that teaches cloud architecture. Build infrastructure, survive traffic, learn scaling. [source]

Ancient Beast

A turn based strategy indie game project played online against other people. [source]

Athena Crisis

A modern-retro turn-based tactical strategy game. [source]

C-evo

A freeware empire-building game for Windows. [source]

fheroes2

A recreation of Heroes of Might and Magic II game engine. [source]

FreeCol

A turn-based strategy game based on the old gameColonization, and similar to Civilization. [source]

Freeciv

A Free and Open Source empire-building strategy game. [source]

FreeOrion

A free, open source, turn-based space empire and galactic conquest (4X) computer game. [source]

Hnefatafl

The game of Copenhagen Hnefatafl. Sort of like chess. [source]

OpenPanzer

Javascript/HTML5 rewrite of Panzer General II game. [source]

OpenXcom

An open-source clone of the popular UFO: Enemy Unknown and X-COM: Terror From the Deep video games by MicroPros. [source]

The Battle for Wesnoth

A turn-based strategy game with a high fantasy theme. [source]

Unciv

Open-source Android/Desktop remake of Civilization V. [source]

VCMI Project

Open-source engine for Heroes of Might and Magic III. [source]

Awesome Game Remakes

Awesome Open Source Games

Collection of games that have the source code available on GitHub.

Games on GitHub

Popular/awesome videos games, add-on, maps, etc. hosted on GitHub.

Libre Game Wiki

List of (interesting) FOSS game engine replacement projects

List of Open Source Games

Mac Source Ports

Open Source Game Clones

Wikipedia list open-source video games