A certain block game
Build multiplayer web games played by millions
Free and open source real-time strategy game
Dedicated Game Server Hosting and Scaling for Multiplayer Games
Multiplayer FPS game - Counter-Strike: Football
A lightweight, modular and versatile mod loader for Minecraft Bedrock
Open-source Android/Desktop remake of Civ V
You can make it - Open Source MMORPG Platform
s&box is a modern game engine, built on Valve's Source 2
Gradient Bang is an online multiplayer universe
V1, Mirror Classic. V2, Mirror Engine: Join Discord for access
Minecraft map editor and mod
An open-source sandbox tower defense game
Xash3D FWGS engine
Classic overhead run-and-gun game
Netcode that provides networking capabilities to GameObject workflows
OpenSoldat is a unique 2D (side-view) multiplayer action game
Real Time Strategy game engine supporting early Westwood classics
An open source reimplementation of the Among Us Server
Voxel game-creation platform with easy modding and game creation
Magic Another Game Engine
Fully async, multithreaded, predictive, open source, 3.01 reach
Empowering everyone to host fast and efficient Minecraft servers
Open source simulation game based on Transport Tycoon Deluxe
Source code repository of the FreeOrion project