Open Source Games

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

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

Desktop/Android/HTML5/iOS Java game development framework

Simple DirectMedia Layer

An open source re-implementation of RollerCoaster Tycoon 2 🎢

Clone of the Age of Empires II engine 🚀

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

The source code to VVVVVV! http://thelettervsixtim.es/

Space exploration, trading, and combat game.

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

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

The code base of SuperTuxKart

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

Classic Tomb Raider open-source engine

Open source clone of Theme Hospital

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

Reviving the language that brought us the Jak & Daxter Series

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

An open source re-implementation of Caesar III

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

No description.

Fallout for modern operating systems

Open Source codebase of the game Overgrowth by Wolfire Games LLC

ScummVM main repository

An OpenGL RTS game engine written in C

Fallout 2 for modern operating systems

Chocolate Doom is a Doom source port that is minimalist and historically accurate.

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

A cross-platform minigolf game written in C.

A game of lonely space adventure

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

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

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

Open source remake and Fan Expansion of Dungeon Keeper.

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