The 🎮 Open Source Game Development (OSGD) Collection is a curated list of freely available open-source game development resources that anyone can access. The purpose of the list is to serve as a central repository of open-source game development projects for anyone to discover, use, or contribute to.

Engines

o3de

o3de

Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D engine that enables developers and content creators to build AAA games, cinema-quality 3D worlds, and high-fidelity simulations without any fees or commercial obligations.

⭐ 7653
🚩 3645
C++

GDevelop

4ian

🎮 Open-source, cross-platform 2D/3D/multiplayer game engine designed for everyone.

⭐ 9133
🚩 481
JavaScript

pygame

pygame

🐍🎮 pygame (the library) is a Free and Open Source python programming language library for making multimedia applications like games built on top of the excellent SDL library. C, Python, Native, OpenGL.

⭐ 7320
🚩 424
C

renpy

renpy

The Ren'Py Visual Novel Engine

⭐ 4917
🚩 241
Ren'Py

Babylon.js

BabylonJS

Babylon.js is a powerful, beautiful, simple, and open game and rendering engine packed into a friendly JavaScript framework.

⭐ 23028
🚩 43
TypeScript

love

love2d

LÖVE is an awesome 2D game framework for Lua.

⭐ 4857
🚩 95
C++

pixijs

pixijs

The HTML5 Creation Engine: Create beautiful digital content with the fastest, most flexible 2D WebGL renderer.

⭐ 43548
🚩 370
TypeScript

OpenRA

OpenRA

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.

⭐ 14574
🚩 1542
C#

bevy

bevyengine

A refreshingly simple data-driven game engine built in Rust

⭐ 35106
🚩 2270
Rust

pyxel

kitao

A retro game engine for Python

⭐ 14561
🚩 8
Rust

engine

playcanvas

JavaScript game engine built on WebGL, WebGPU, WebXR and glTF

⭐ 9537
🚩 562
JavaScript

godot

godotengine

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

⭐ 88826
🚩 13451
C++
Code

boardgame.io

boardgameio

State Management and Multiplayer Networking for Turn-Based Games

⭐ 9994
🚩 107
TypeScript

box2d

erincatto

Box2D is a 2D physics engine for games

⭐ 8077
🚩 3
C

allegro5

liballeg

The official Allegro 5 git repository. Pull requests welcome!

⭐ 1839
🚩 386
C

colyseus

colyseus

⚔ Multiplayer Framework for Node.js

⭐ 5769
🚩 43
TypeScript

lwjgl3

LWJGL

LWJGL is a Java library that enables cross-platform access to popular native APIs useful in the development of graphics (OpenGL, Vulkan, bgfx), audio (OpenAL, Opus), parallel computing (OpenCL, CUDA) and XR (OpenVR, LibOVR, OpenXR) applications.

⭐ 4733
🚩 94
Java

bullet3

bulletphysics

Bullet Physics SDK: real-time collision detection and multi-physics simulation for VR, games, visual effects, robotics, machine learning etc.

⭐ 12424
🚩 331
C++

egui

emilk

egui: an easy-to-use immediate mode GUI in Rust that runs on both web and native

⭐ 21621
🚩 743
Rust

raylib

raysan5

A simple and easy-to-use library to enjoy videogames programming

⭐ 21510
🚩 23
C

ink

inkle

inkle's open source scripting language for writing interactive narrative.

⭐ 4055
🚩 329
C#

nakama

heroiclabs

Distributed server for social and realtime games and apps.

⭐ 8828
🚩 109
Go

JoltPhysics

jrouwe

A multi core friendly rigid body physics and collision detection library. Written in C++. Suitable for games and VR applications. Used by Horizon Forbidden West.

⭐ 6442
🚩 7
C++

imgui

ocornut

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

⭐ 59395
🚩 1066
C++
Art

krita

KDE

Krita is a free and open source cross-platform application that offers an end-to-end solution for creating digital art files from scratch built on the KDE and Qt frameworks.

⭐ 7193
🚩 0
C++

goxel

guillaumechereau

Goxel: Free and Open Source 3D Voxel Editor

⭐ 2769
🚩 89
C++

rx

cloudhead

👾 Modern and minimalist pixel editor

⭐ 3096
🚩 37
Rust

LibreSprite

LibreSprite

Animated sprite editor & pixel art tool -- Fork of the last GPLv2 commit of Aseprite

⭐ 4791
🚩 44
C++

blender

blender

Official mirror of Blender

⭐ 12767
🚩 0
C++

Pixelorama

Orama-Interactive

Unleash your creativity with Pixelorama, a powerful and accessible open-source pixel art multitool. Whether you want to create sprites, tiles, animations, or just express yourself in the language of pixel art, this software will realize your pixel-perfect dreams with a vast toolbox of features. Available on Windows, Linux, macOS and the Web!

⭐ 6899
🚩 43
GDScript

aseprite

aseprite

Animated sprite editor & pixel art tool (Windows, macOS, Linux)

⭐ 28596
🚩 1615
C++

piskel

piskelapp

A simple web-based tool for Spriting and Pixel art.

⭐ 11043
🚩 349
JavaScript
Audio

jfxr

ttencate

A browser-based tool to create sound effects for games.

⭐ 429
🚩 18
JavaScript

furnace

tildearrow

a multi-system chiptune tracker compatible with DefleMask modules

⭐ 2239
🚩 40
C++

lmms

LMMS

Cross-platform music production software

⭐ 7971
🚩 1119
C++

audacity

audacity

Audio Editor

⭐ 12200
🚩 1276
C
Design

ldtk

deepnight

Modern, lightweight and efficient 2D level editor

⭐ 3352
🚩 295
Haxe

tiled

mapeditor

Flexible level editor

⭐ 11022
🚩 725
C++
Games

osu

ppy

rhythm is just a *click* away!

⭐ 15041
🚩 1377
C#

warzone2100

Warzone2100

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+

⭐ 3166
🚩 442
C++

devilution

diasurgical

Diablo devolved - magic behind the 1996 computer game

⭐ 8754
🚩 38
C++

warriorjs

olistic

🏰 An exciting game of programming and Artificial Intelligence

⭐ 9417
🚩 20
JavaScript

OpenRCT2

OpenRCT2

An open source re-implementation of RollerCoaster Tycoon 2 🎢

⭐ 13290
🚩 1531
C++

OpenTTD

OpenTTD

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

⭐ 6226
🚩 288
C++

Mindustry

Anuken

The automation tower defense RTS

⭐ 22105
🚩 192
Java

openage

SFTtech

Free (as in freedom) open source clone of the Age of Empires II engine 🚀

⭐ 12634
🚩 221
Python

shapez.io

tobspr-games

shapez is an open source base building game on Steam inspired by factorio!

⭐ 6358
🚩 194
JavaScript

Thrive

Revolutionary-Games

The main repository for the development of the evolution game Thrive.

⭐ 2776
🚩 717
C#

lila

lichess-org

♞ lichess.org: the forever free, adless and open source chess server ♞

⭐ 15047
🚩 1081
Scala