Open Source Games

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

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

A refreshingly simple data-driven game engine built in Rust

The automation tower defense RTS

Desktop/Android/HTML5/iOS Java game development framework

Archived — A list of games, add-ons, maps, etc. hosted on GitHub. Any genre. Any platform. Any engine.

Command & Conquer: Remastered Collection

DOOM Open Source Release

Open Source real-time strategy game engine for early Westwood games such as Command & Conquer: Red Alert written in C# using SDL and OpenGL. Runs on Windows, Linux, *BSD and Mac OS X.

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.

Open-source Android/Desktop remake of Civ V

An open source re-implementation of Diablo 2

Diablo build for modern operating systems

A Super Mario 64 decompilation, brought to you by a bunch of clever folks.

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

Quake III Arena GPL Source Release

A work-in-progress, open-source, multi-player city simulation game.

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

[mirror of https://gitlab.com/veloren/veloren] An open world, open source voxel RPG inspired by Dwarf Fortress and Cube World. This repository is a mirror. Please submit all PRs and issues on our GitLab page.

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/

Shattered Pixel Dungeon is an open-source traditional roguelike dungeon crawler with randomized levels and enemies, and hundreds of items to collect and use. It's based on the source code of Pixel Dungeon, by Watabou.

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

Quake GPL Source Release

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

Classic Tomb Raider open-source engine

No description.

Command and Conquer: Generals - Zero Hour

Open source clone of Theme Hospital

Main game repository for Beyond All Reason.

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+

Official NetHack Git Repository

A multiplayer game about paranoia and chaos on a space station. Remake of the cult-classic Space Station 13.

Farbrausch demo tools 2001-2011

Reviving the language that brought us the Jak & Daxter Series

Open source recreation of Daggerfall in the Unity engine

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

An open source re-implementation of Caesar III

Quake 2 GPL Source Release

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