Voxel game-creation platform with easy modding and game creation
A cross-platform PSP emulator
Desktop/Android/HTML5/iOS Java game development framework
SDL library for Android, including several games.
Self-hosted game stream host for Moonlight
Stream switch games to your PC via USB or network
Open-source engine for Heroes of Might and Magic III
UCI chess engine
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
The game engine for everyone
Solar2D Game Engine main repository (ex Corona SDK)
Home theater software and entertainment hub for digital media
Mangos ZERO is a server for World of Warcraft
A lightweight game server framework implemented with Actor Model
Multi-platform 2D and 3D game engine
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Open source clone of the Age of Empires II engine
Cocos simplifies game creation and distribution with Cocos Creator
Open source simulation game based on Transport Tycoon Deluxe
Open Source MMORPG Framework
Android, UIQ 3.0, Series 60 Edition 5 open-source software
A free/open source client and automation tool for Ragnarok Online
Experimental PlayStation Vita emulator
Diablo build for modern operating systems
Descent 3 by Outrage Entertainment