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

Command & Conquer: Remastered Collection

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 🎢

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

Diablo build for modern operating systems

Quake III Arena GPL Source Release

Doom 3 BFG Edition

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.

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

Dungeon Crawl: Stone Soup official repository

Open Source codebase of the game Overgrowth by Wolfire Games LLC

ScummVM main repository

An OpenGL RTS game engine written in C

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

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

Command and Conquer: Renegade

A free/open source client and automation tool for Ragnarok Online

Unreal Engine 1 Reimplementation

An Open Source Pixelart Science-Fiction Real-Time-Strategy game

AssaultCube

Source code repository of the FreeOrion project.

Open source remake and Fan Expansion of Dungeon Keeper.

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

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

Ambermoon rewrite in C#

Base environment for Red Eclipse and associated source files.

A replacement engine for Ultima VII The Black Gate (and eventually Serpent Isle) that presents a new camera angle and other improvements.

Importer and scripts for Warcraft II: Tides of Darkness, the expansion Beyond the Dark Portal, and Aleonas Tales

Anura Engine

A new and modern engine for custom Tomb Raider levels incorporating classic features and new enhancements.

This is the official GitHub mirror for the FTEQW project.

Settlers 1 clone written in C#

Moddable engine reimplementation of the Japanese roguelike Elona.

Brood War API

Wouter van Oortmerssen's Cube source code

Wolf4SDL is an open-source port of id Software's classic first-person shooter Wolfenstein 3D to the cross-platform multimedia library SDL. It is meant to keep the original feel while taking advantage of some improvements.