Multiplayer GitHub Repositories (2026) · Open Source Tools

One code, and you're in the same room. Remote multiplayer between Android emulators: 3DS, Switch, PSP, PS2, DS and WII.

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

The 2012 Forza Horizon, native on Windows and Linux, and online again: Horizon World, leaderboards and Rivals on a public server you can also self-host. Bring your own copy.

An open source re-implementation of RollerCoaster Tycoon 2 🎢

⚔ Multiplayer Framework for Node.js

Rivet Actors are the primitive for stateful workloads. Built for AI agents, collaborative apps, and durable execution.

Play Doom deathmatch while Claude works. A Claude Code plugin.

A networking library to make multiplayer games for the Bevy game engine

Play Morrowind in your browser — the OpenMW engine compiled to WebAssembly, now with multiplayer and a cloud locker for your own game data.

Multiplayer client for Call of Duty: Modern Warfare 2 (2009).

Scalable open-source game backend server: multiplayer, matchmaking, leaderboards, chat, and social features for games.

Data table and data grid components built with shadcn/ui, featuring sorting, filtering, pagination, infinite scrolling, and real-time collaboration.

TrinityCore Open Source MMO Framework (master = 12.1.5.70688, 3.3.5 = 3.3.5a.12340, cata classic = 4.4.2.60895)

Multiplayer top-down shooter made from scratch in C++. Web version: https://play.hypersomnia.io Made in 🇵🇱

Globed is an open-source, highly customizable multiplayer mod for Geometry Dash.

Quilkin is a non-transparent UDP proxy specifically designed for use with large scale multiplayer dedicated game server deployments, to ensure security, access control, telemetry data, metrics and more.

Command the forces of The Project in a battle to rebuild the world after mankind has been nearly destroyed by nuclear missiles. A 100% free and open source real-time strategy game for Windows, macOS, Linux, BSD+

A server-authoritative replication crate for Bevy.

Halo CE: Ported for Everyone. Windows, Mac, Linux, Steam Deck, Android and FreeBSD, with online games and stats. Bring your own copy of the game.

Dedicated Game Server Hosting and Scaling for Multiplayer Games on Kubernetes