You can make it - Open Source MMORPG Platform
A Minecraft Launcher which is multi-functional, cross-platform
Godot is a powerful cross-platform game engine
s&box is a modern game engine, built on Valve's Source 2
A complete 3-D game development suite written in Java
Self-hosted game stream host for Moonlight
Xash3D FWGS engine
The main repository for the Linux and Mac OS Bedrock edition Minecraft
A cross-platform PSP emulator
A Minecraft Java Edition Launcher for Android and iOS
Set of Python modules designed for writing video games
Atmosphère is a work-in-progress customized firmware for the Nintendo
Lutris desktop client in Python
Open source cross-platform multi-purpose game toolkit
Voxel game-creation platform with easy modding and game creation
An Open Source Minecraft Launcher with Modern UX
Mangos ZERO is a server for World of Warcraft
Powerful, mature open-source cross-platform game engine for Python
Free and open source real-time strategy game
Cross-platform 2D and 3D game engine with modular architecture
One framework for creating powerful cross-platform games
Cross-platform rhythm game for the keyboard
Open Source MMORPG Framework
The Modrinth monorepo containing all code which powers Modrinth
Cocos simplifies game creation and distribution with Cocos Creator