A certain block game
#1 Open Source Unity Networking Library
Free and open source real-time strategy game
Highly compatible N64 emulator
Dedicated Game Server Hosting and Scaling for Multiplayer Games
Gradient Bang is an online multiplayer universe
Painless peer-to-peer WebRTC networking for rust wasm
Multiplayer Framework for Node.js
Open-source Android/Desktop remake of Civ V
An open-source sandbox tower defense game
You can make it - Open Source MMORPG Platform
Minecraft map editor and mod
A lightweight, modular and versatile mod loader for Minecraft Bedrock
Multiplayer at the speed of light
s&box is a modern game engine, built on Valve's Source 2
Xash3D FWGS engine
Classic overhead run-and-gun game
Voxel game-creation platform with easy modding and game creation
Real Time Strategy game engine supporting early Westwood classics
Instant is a modern Firebase
An open source reimplementation of the Among Us Server
An unofficial rules engine for the world's greatest card game
Multiplayer FPS game - Counter-Strike: Football
Netcode that provides networking capabilities to GameObject workflows
Magic Another Game Engine