A retro game engine for Python
A charting and data visualization library for Unity
Flexible level editor
The game engine for everyone
Powerful, mature open-source cross-platform game engine for Python
Provides efficient allocation free async/await integration for Unity
Open source clone of the Age of Empires II engine
Simple GTK# Paint Program
Open-source engine for Heroes of Might and Magic III
Lightweight console for Minecraft chat and automated scripts
Mangos ZERO is a server for World of Warcraft
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
You can make it - Open Source MMORPG Platform
Cross-platform, open source, and super fast MUD client with scripting
A .NET ascii/ansi console engine written in C# for MonoGame and XNA
The Open Toolkit library is a fast, low-level C# wrapper for OpenGL
ThinkPHP Framework
Enables Roblox developers to use professional software tools
A Steam library categorizing tool
A fast and reliable entity component system (ECS) and much more
Vulkan renderer mod for Minecraft
Netcode that provides networking capabilities to GameObject workflows
Homebrew development library for Nintendo 3DS/Horizon OS user mode
Rust library to create a Good Game Easily
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D