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.

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

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

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

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.

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! ;)

Huge library of matcap PNG textures organized by color

Quake 2 GPL Source Release

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