NebulaModTeam / nebula

A multiplayer mod for the game Dyson Sphere Program

kgoedecke / doop

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

daid / EmptyEpsilon

Open source bridge simulator. Build with the SeriousProton engine.

Quaver / Quaver

The ultimate community-driven, and open-source competitive rhythm game available on Steam.

heroiclabs / nakama-godot

Nakama Godot Client SDK

Unity-Technologies / ECS-Network-Racing-Sample

ECS multiplayer racing sample to showcase using Unity Entities and netcode with best practices

jojodogm-ctrl / emufii

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

Kaetram / Kaetram-Open

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

luskaner / ageLANServer

Web Server (and its launcher) for AoE 1, 2, 3 (all DE), AoE 4 and AoM: RT supporting offline multiplayer, fully cross-platform and portable

etlegacy / etlegacy

ET: Legacy is an open source project based on the code of Wolfenstein: Enemy Territory which was released in 2010 under the terms of the GPLv3 license.

GameFrameX / GameFrameX

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。

space-wizards / RobustToolbox

Robust multiplayer game engine, used by Space Station 14

c22dev / muguet

A native Mach-O port for iOS/macOS of GTA V, with multiplayer

pokerth / pokerth

PokerTH is a poker game written in C++/Qt.

youngmonkeys / ezyfox-server

A socket server (include SSL) supports realtime application, realtime game, MMORPG, messaging, chat and streaming data with TCP, UDP and Websocket

openmultiplayer / open.mp

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

simgine / bevy_replicon

A server-authoritative replication crate for Bevy.

afwbkbc / glsmac

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

Tornamic / CoopAndreas

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

lemma-work / lemma-platform

Multiplayer harness that shapes around your work. Agents, apps and workflows your team shares, used from Slack, Telegram, WhatsApp, Teams, Email, Web or your own AI agent.

damian-pastorini / reldens

Reldens - You can make it - Open Source MMORPG Platform

MirageNet / Mirage

Easy to use high performance Network library for Unity 3d

Unity-Technologies / multiplayer-community-contributions

Community contributions to Unity Multiplayer Networking products and services.

Dreamtowards / Ethertum

A Voxel Multiplayer Sandbox Survival Game built in Rust & Bevy.

codergautam / worldguessr

Free & Open source version of Geoguessr

TannerMidd / pi-pocket

A durable, multiplayer, mobile-first web app for Pi agents, built on Pi Durable

mmatyas / supermariowar

A fan-made multiplayer Super Mario Bros. style deathmatch game

No-Instructions / Relay

Multiplayer Mode for Obsidian

oTree-org / oTree

Python framework for multiplayer decision games, behavioral experiments, and surveys

BeamMP / BeamMP

Bringing multiplayer to BeamNG.drive

AnkleBreaker-Studio / unity-mcp-server

Unity MCP Server — 268 tools for AI-assisted game development. Connect Claude, Cursor, or any MCP client to Unity Editor & Unity Hub. Scene management, GameObjects, components, builds, profiling, Shader Graph, Amplify, terrain, physics, NavMesh, animation, MPPM multiplayer & more. Free & open source by AnkleBreaker Studio.

HarbourMasters / Lighthouse

A Banjo-Kazooie PC port with Anchor multiplayer, romhack and multi-language support, and a built-in randomizer.

0sec-labs / 0

The multiplayer AI offensive security OS - open, self-improving, extensible. Find, verify, and fix vulnerabilities.

samuelit0davila / fifa-street-pc-port

ReStreet: FIFA Street (2012) recompiled for Windows PC, with online play, a launcher with friends, chat and rooms. Bring your own game.

rust-alert / ra2.exe

使用 Rust 对《红色警戒 2》进行了现代化重写，现已支持高分辨率，窗口化，跨平台等特性，且额外支持《尤里的复仇》、《心灵终结》等 DLC。

Paradigm-Study / claude-share

Multiplayer sessions for Claude Code. Share a link, work together live, and review the same replies, tools and previews.

ra2-games / ra2

Fan-Made Web Port of Red Alert 2 w/ Yuri's and multiplayer

mrzh7 / scam-with-your-friends-web

Scam With Your Friends Web: unofficial open-source browser remake. Co-op AI call center game with a 3D office, voice chat and daily quotas. React + Three.js; self-host on Cloudflare. Русский язык: кооперативная браузерная игра про колл-центр с ИИ.

thetrufflegouda / SWArmada

Unofficial fan-made digital adaptation of Star Wars: Armada featuring 3D tactical battles, fleet building, local hotseat, and online multiplayer.

YomotsuHisami / eagler-touhou

An initiative to bring official Touhou Project games, spin-offs, and fan games to every platform.

agentsea / nautilo

AI goes multiplayer. A self-hosted workspace for people and machine people. Create, code, and work together across desktop, mobile, and web. Open source. MIT licensed.

Shellishack / infinite-pokemon

A Pokémon-style adventure built with Codex, featuring AI-generated maps, NPCs, branching saves, and multiplayer. The adventure never ends.

RoversX / ThinkTerm

A modern terminal with a built-in multiplexer: close it and your sessions keep running. Run shells and tons of AI agents across your machines, then pick them up from desktop, browser, TUI and more. Written in Rust with no UI framework: interface drawn straight on the GPU. No Electron, GPUI or webview.

PepoTechYT / PepoMote

Turn your phone into a motion controller for Dolphin, Cemu, Eden & RetroArch. Wii U second screen and local multiplayer. Free & open source by PepoTech. | Tu móvil como mando: movimiento, segunda pantalla de Wii U y multijugador local. Gratis y de código abierto.

bnunu / halo-ce-universal

Fork of cybersecurity/halo-ce-universal (Halo: Combat Evolved decomp ported to Windows, Linux and Android) with multiplayer raised to 128 players and 128 machines

DomazinUS / RaceWave46

An AI-assisted Wave Race 64 recompilation for Windows, with modern graphics and expanded local multiplayer.

jarrodwatts / intermission

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

Infinite-Heaven / SephiriaBackpackOrganizer

BepInEx plugin for Sephiria (Steam 2436940). Press F8 to auto-arrange your inventory: offline scoring model + simulated annealing, supports tablets, position charms, planet clusters, harmony crystals, dedication badges, compass pairing, hourglass-magicbook synergy and more. Works for host and multiplayer clients.

SirSamael / ppsspp-switch-community-build

Modern PPSSPP community build for Nintendo Switch based on the official PPSSPP source. Supports current Atmosphère/firmware 22.5.0 with active multiplayer improvements and ongoing development.

ChupathingyCE / chupathingyce

Chupathingy: Halo: Combat Evolved running natively on Windows, Mac, Linux and Android. A port of the Halo CE decomp project, built for stability and community multiplayer, with its own dedicated servers and the Delta network.

aethai / ro3emu-server

Open-source Ragnarok Online 3 (RO3) PC server emulator in C# / .NET 10. Client-documented protocol, multiplayer systems, tools and research.

pelazas / p2pmux

Multiplayer terminal multiplexer where multiple users and machines can connect to a same session

no6969el / GEVR

Native from-source GoldenEye VR (OpenXR). Bring your own ROM. Beta — enjoy it now; multiplayer later.

linkssy2 / RoadRash64Recompiled

Unofficial Road Rash 64 PC recompilation with 60 FPS presentation, MAX LOD, widescreen, custom music and experimental multiplayer. Requires your own ROM.

stevelasudata / sky-dragon-duel-brain

Human-Like Roblox Dragon PvP Bot AI 2026: Realistic Flight, Dodging & Combat

woodsytrain / WARDOGS-Reflex-Training-Sandbox

Open-Source Single-Player Game Trainer Framework for 2026 Stealth Memory Practice

ClayStan404 / hexproof

Native desktop multiplayer tabletop for Magic: The Gathering. Manual tables, draft/sealed/cube, and connected-hub Swiss tournaments.

tanantha444-collab / lune-egg-chase-deterministic-net

Type-Safe Multiplayer Egg Hunt Engine 2026: Crash-Safe Payments and Deterministic RNG

skWarehouse904 / avatar-musical-chairs

Body Swap Royale Eliminator: 2026 Multiplayer Avatar Shuffle Arena Game

ZDSADSDSAD / math-arena-clash

Best Multiplayer Math Battle Game on Roblox 2026: Competitive Learning Duels