multiplayer

Share coding agents with your team on phone and desktop

Open source bridge simulator. Build with the SeriousProton engine.

A fast C++23 3D game engine for modern devices, with wide platform support

Source code for the Cities: Skylines Multiplayer mod (CSM)

Nakama Godot Client SDK

Modular inventory system for godot 4 with nodes, compatible with multiplayer, separate logic from the UI, Using items as separate resources.

Kaetram is an open-source 2D HTML5 MMORPG. It is an extended version of BrowserQuest (BQ).

Open "Minecraft-like" game with multiplayer support and Lua scripting support for the both client and server

A minimalist CPU-based 3D console engine in C# (.NET 8) built from scratch. Features Raycasting/Raytracing, dynamic lighting & shadows, .obj loader, and custom TCP-based multiplayer with real-time chat. No external graphics APIs.

Zetrith's Multiplayer mod for RimWorld

GBC Zelda-inspired game with online multiplayer. Built with Godot Engine

The free and privacy respecting pictionary game - Play at https://scribblers.bios-marcel.link

A server-authoritative replication crate for Bevy.

NOTE: development in stuntrally3 repo. 3D racing game based on VDrift and OGRE with own Track Editor. The main repository with Stunt Rally 2.x sources and data.

An open-source toolbox that takes a game all the way "from idea → built → live" — Unity/Godot/Cocos/Laya clients + one .NET server. | 开源游戏全流程工具箱：Unity/Godot/Cocos/Laya 客户端 + .NET 服务器，从想法到上线一站搞定。

Shared cockpit for Microsoft Flight Simulator.

🎮 A frictionless multiplayer web app that lets you play Set with friends

Open Multiplayer, a multiplayer mod fully backwards compatible with SA-MP

Unofficial open-source OpenGL/SDL2 reimplementation of Sid Meier's Alpha Centauri ( + Alien Crossfire )

JSON-RPC 2.0 implementation over WebSockets for Node.js and JavaScript/TypeScript

The open-source alternative to Paper.design. A multiplayer design canvas where humans and AI agents design together, live. MCP built in.

World of Warcraft client-server combat system implementation in Unity with Photon Bolt.

Cooperative multiplayer mod for GTA:SA (in active development)

Reldens - You can make it - Open Source MMORPG Platform

Make P2P multiplayer browser games, no server hosting or synchronization code required. Powered by rollback netcode + WebRTC.

Multiplayer game framework

Easy to use high performance Network library for Unity 3d

Hollow Knight Multiplayer

Multiplayer mod for Kerbal Space Program (KSP)

Use Tailsteam instead of Tailscale!!!