Open Source Games

Godot Engine – Multi-platform 2D and 3D game engine

Dear ImGui: Bloat-free Graphical User interface for C++ with minimal dependencies

Command & Conquer: Remastered Collection

DOOM Open Source Release

An open source re-implementation of RollerCoaster Tycoon 2 🎢

Cataclysm - Dark Days Ahead. A turn-based survival game set in a post-apocalyptic world.

Diablo build for modern operating systems

OpenTTD is an open source simulation game based upon Transport Tycoon Deluxe

Space exploration, trading, and combat game.

An open source, turn-based strategy game with a high fantasy theme.

Command and Conquer: Red Alert

OpenMW is an open-source open-world RPG game engine that supports playing Morrowind. Main repo and issue tracker can be found here: https://gitlab.com/OpenMW/openmw/

Open-source engine for Heroes of Might and Magic III

Doom 3 BFG Edition

The code base of SuperTuxKart

Powerful, mature open-source cross-platform game engine for Python and C++, developed by Disney and CMU

Command and Conquer: Generals - Zero Hour

A powerful free cross-platform RTS game engine. - Report issues at https://springrts.com/mantis/

Command the forces of The Project in a battle to rebuild the world after mankind has been nearly destroyed by nuclear missiles. A 100% free and open source real-time strategy game for Windows, macOS, Linux, BSD+

Farbrausch demo tools 2001-2011

fheroes2 is a recreation of Heroes of Might and Magic II game engine

Widelands is a free, open source real-time strategy game with singleplayer campaigns and a multiplayer mode. The game was inspired by Settlers II™ (© Bluebyte) but has significantly more variety and depth to it.

Descent 3 by Outrage Entertainment

Dungeon Crawl: Stone Soup official repository

Fallout for modern operating systems

Open Source codebase of the game Overgrowth by Wolfire Games LLC

ScummVM main repository

Fallout 2 for modern operating systems

OpenRW "Open ReWrite" is an un-official open source recreation of the classic Grand Theft Auto III game executable

Open-source clone of the original X-Com 👽

UZDoom is a feature centric port for all Doom engine games, based on GZDoom, adding an advanced renderer and powerful scripting capabilities

[ARCHIVED] Modern reimplementation of the Diablo 1 game engine

:deciduous_tree::house_with_garden::office::evergreen_tree: A city building simulation game

Decompilation of The Legend of Zelda: Twilight Princess

A game of lonely space adventure

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

Command and Conquer Tiberian Dawn

Multiplayer top-down shooter made from scratch in C++. Web version: https://play.hypersomnia.io Made in 🇵🇱

Command and Conquer: Renegade

Main development repository for Rigs of Rods soft-body physics simulator

Unreal Engine 1 Reimplementation

Source code repository of the FreeOrion project.

A modern re-implementation of the classic DOS game Duke Nukem II

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

Open reimplementation of Might and Magic 6 7 8 game engine

DDraceNetwork, a free cooperative platformer game

Reverse-engineered ports of Build games using EDuke32 engine technology and development principles (NBlood/Rednukem/PCExhumed)

The Stratagus strategy game engine

Exult is a project to recreate Ultima 7 for modern operating systems, using the game's original plot, data, and graphics files.

FIFE is a multi-platform isometric game engine