Gamedev GitHub Repositories (2026) · Open Source Tools

Rednex Game Boy Development System - An assembly toolchain for the Nintendo Game Boy and Game Boy Color

An Open Source C# 3D Game Engine under MIT license, inspired by Unity and featuring a complete editor

A networking library to make multiplayer games for the Bevy game engine

Curated, CC0 reference hub for 3D, VFX, and game dev. 3,400+ tools, assets, and tutorials across 12 sections. Searchable, filterable, free.

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

A small C# game framework

A foundational Haxe framework for cross-platform development

Unreal Engine Vibe Coding tool

Thunder Engine – Cross-platform 2D and 3D game engine with modular architecture

Cross-platform 2D game engine focused on ultimate productivity built in .NET

A high performance Vulkan/DX12 game engine in C++ & C#

:mushroom: Full stack voxel engine

Simple and Fast Graphical User Interface

🎮 · Jazz² Resurrection: Native C++ reimplementation of Jazz Jackrabbit 2

Easy to use cross-platform 2D game library for C++

Repository of behaviors, actions, conditions and expressions to be used in GDevelop for creating games

Modern C# bindings and native NuGet packages for SDL3 and its companion libraries.

Multi-modal constructive solid geometry kernel in Rust

An example implementation binding the Microsoft GDK, XBOX Services, PlayFab and GameInput to Godot 4. Provides GDExtension and Game references for shipping on XBOX on PC.

Cross-platform 2D and 3D game engine written on Swift. Windows, Apple and more.