Magictools

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

Desktop/Android/HTML5/iOS Java game development framework

🎮 A step-by-step guide to implementing SSAO, depth of field, lighting, normal mapping, and more for your 3D game.

DOOM Open Source Release

A Study Path for Game Programmer

A retro game engine for Python

Cross-platform, graphics API agnostic, "Bring Your Own Engine/Framework" style rendering library.

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.

Gaming meets modern C++ - a fast and reliable entity component system (ECS) and much more

Scalable open-source game backend server: multiplayer, matchmaking, leaderboards, chat, and social features for games.

State Management and Multiplayer Networking for Turn-Based Games

A single-header ANSI C immediate mode cross-platform GUI library

A Flutter based game engine.

Quake III Arena GPL Source Release

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

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

A running-jumping-swordfighting game I made on the Apple II from 1985-89

:rocket: 🌪 Super-fast 3D framework for Web Applications 🥇 & Games 🎮. Based on Three.js

Quake GPL Source Release

A procedural textures authoring and 3D model painting tool based on the Godot game engine

Java / JavaFX / Kotlin Game Library (Engine)

Cross-platform game engine in Rust.

A modern cross-platform low-level graphics library and rendering framework

3D C++ Game Engine - yet another open source game engine

Official NetHack Git Repository

Doom 3 GPL source release

Improved version of the X-Ray Engine, the game engine used in the world-famous S.T.A.L.K.E.R. game series by GSC Game World. Join OpenXRay! ;)

AI Skills, MCP Tools, and CLI for Unity Engine. Full AI develop and test loop. Use cli for quick setup. Efficient token usage, advanced tools. Any C# method may be turned into a tool by a single line. Works with Claude Code, Gemini, Copilot, Cursor and any other absolutely for free.

Quake 2 GPL Source Release

Huge library of matcap PNG textures organized by color

Goxel: Free and Open Source 3D Voxel Editor

The original open source release of Wolfenstein 3D

Android OpenGL ES 2.0/3.0 Engine

A 2D online multiplayer game taking place in a submarine travelling through the icy depths of Jupiter's moon Europa.

A Fasttracker II compatible music editor

FamiStudio NES Music Editor

A lightweight single-header cross-platform library for general windowing

Pixel Vision 8's core philosophy is to teach retro game development with streamlined workflows. PV8 is also a platform that standardizes 8-bit fantasy console limitations built on top of the open-source C# game engine based on MonoGame.

Open source release of Canabalt for iOS

Axmol Engine – A Multi-platform Engine for Desktop, XBOX (UWP), WebAssembly and Mobile games. (a fork of Cocos2d-x-4.0)

Node base VFX editor for pixel art.

Automatically exported from code.google.com/p/micropolis

Pixel art editor for macOS and iOS

DotRecast - a C# port of Recast & Detour, Industry-standard navigation mesh toolset for .NET, Unity3D, games, servers

2D Game Engine with Lua Scripting made on top of SFML !

A small C# game framework

Overlap2D Game development toolkit for UI and Level design

Planimeter Game Engine 2D - LÖVE-based game engine for Lua

High performance 2D collision detection system with realistic physics responses.

Classic point and click adventure game engine and editor