Compatibility tool for Steam Play based on Wine and other components
Desktop/Android/HTML5/iOS Java game development framework
The Playstation 2 emulator
Diablo build for modern operating systems
UCI chess engine
Fast PlayStation 1 emulator for x86-64/AArch32/AArch64
Flexible level editor
Create custom themes for the Nintendo Switch
The game engine for everyone
Powerful, mature open-source cross-platform game engine for Python
Open source clone of the Age of Empires II engine
Mangos ZERO is a server for World of Warcraft
Open-source engine for Heroes of Might and Magic III
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Cross-platform, open source, and super fast MUD client with scripting
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Animation Compression Library
A fast and reliable entity component system (ECS) and much more
A downloadable game for Windows, macOS, and Linux
lua dev plugin for unreal engine 4 or 5
Flax Engine, multi-platform 3D game engine
Real-time collision detection and multi-physics simulation for VR
An Open Source DOS emulator to run old DOS games
A simulator for drones, cars and more, built on Unreal Engine
SnapKey: Open Source Alternative to Snap Tap & SOCD