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.

⭐ 7500
🚩 3620
C++

renpy

renpy

The Ren'Py Visual Novel Engine

⭐ 4688
🚩 238
Ren'Py

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.

⭐ 7098
🚩 395
C

GDevelop

4ian

:video_game: Open-source, cross-platform game engine designed to be used by everyone.

⭐ 7016
🚩 490
JavaScript

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.

⭐ 14287
🚩 1571
C#

pixijs

pixijs

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

⭐ 42952
🚩 316
TypeScript

Babylon.js

BabylonJS

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

⭐ 22700
🚩 70
TypeScript

love

love2d

LÖVE is an awesome 2D game framework for Lua.

⭐ 4575
🚩 96
C++

pyxel

kitao

A retro game engine for Python

⭐ 13366
🚩 7
Rust

bevy

bevyengine

A refreshingly simple data-driven game engine built in Rust

⭐ 33313
🚩 2159
Rust

engine

playcanvas

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

⭐ 9285
🚩 583
JavaScript

godot

godotengine

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

⭐ 85954
🚩 12791
C++
Code

colyseus

colyseus

⚔ Multiplayer Framework for Node.js

⭐ 5600
🚩 36
TypeScript

boardgame.io

boardgameio

State Management and Multiplayer Networking for Turn-Based Games

⭐ 9918
🚩 101
TypeScript

box2d

erincatto

Box2D is a 2D physics engine for games

⭐ 7397
🚩 44
C++

allegro5

liballeg

The official Allegro 5 git repository. Pull requests welcome!

⭐ 1790
🚩 383
C

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.

⭐ 4659
🚩 86
Java

bullet3

bulletphysics

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

⭐ 12142
🚩 307
C++

raylib

raysan5

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

⭐ 20222
🚩 26
C

egui

emilk

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

⭐ 20507
🚩 748
Rust

ink

inkle

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

⭐ 3954
🚩 324
C#

nakama

heroiclabs

Distributed server for social and realtime games and apps.

⭐ 8519
🚩 114
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.

⭐ 5857
🚩 5
C++

imgui

ocornut

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

⭐ 57231
🚩 1040
C++
Art

goxel

guillaumechereau

Goxel: Free and Open Source 3D Voxel Editor

⭐ 2718
🚩 90
C

rx

cloudhead

👾 Modern and minimalist pixel editor

⭐ 3056
🚩 37
Rust

blender

blender

Official mirror of Blender

⭐ 12038
🚩 0
C++

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.

⭐ 6853
🚩 0
C++

LibreSprite

LibreSprite

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

⭐ 4553
🚩 37
C++

aseprite

aseprite

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

⭐ 27401
🚩 1586
C++

piskel

piskelapp

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

⭐ 10870
🚩 344
JavaScript

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!

⭐ 6358
🚩 39
GDScript
Audio

jfxr

ttencate

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

⭐ 427
🚩 17
JavaScript

furnace

tildearrow

a multi-system chiptune tracker compatible with DefleMask modules

⭐ 2041
🚩 22
C++

audacity

audacity

Audio Editor

⭐ 11750
🚩 1186
C

lmms

LMMS

Cross-platform music production software

⭐ 7758
🚩 1065
C++
Design

ldtk

deepnight

Modern, lightweight and efficient 2D level editor

⭐ 3251
🚩 284
Haxe

tiled

mapeditor

Flexible level editor

⭐ 10785
🚩 690
C++
Games

warriorjs

olistic

🏰 An exciting game of programming and Artificial Intelligence

⭐ 9379
🚩 19
JavaScript

osu

ppy

rhythm is just a *click* away!

⭐ 14613
🚩 1302
C#

devilution

diasurgical

Diablo devolved - magic behind the 1996 computer game

⭐ 8658
🚩 38
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+

⭐ 3085
🚩 410
C++

OpenRCT2

OpenRCT2

An open source re-implementation of RollerCoaster Tycoon 2 🎢

⭐ 13082
🚩 1432
C++

openage

SFTtech

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

⭐ 12488
🚩 208
Python

OpenTTD

OpenTTD

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

⭐ 6063
🚩 273
C++

shapez.io

tobspr-games

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

⭐ 6239
🚩 196
JavaScript

Mindustry

Anuken

The automation tower defense RTS

⭐ 21528
🚩 181
Java

Thrive

Revolutionary-Games

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

⭐ 2665
🚩 681
C#

lila

lichess-org

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

⭐ 14777
🚩 1046
Scala