CLSAMG22 / BBSC
Bloodborne Seamless Co-op: a shadPS4 mod that keeps co-op alive through deaths, lamps, areas, bosses and the Hunter's Dream - up to 5 hunters.
CLSAMG22 / BBSC
OpenRCT2 / OpenRCT2
An open source re-implementation of RollerCoaster Tycoon 2 🎢
TrinityCore / TrinityCore
TrinityCore Open Source MMO Framework (master = 12.1.5.70391, 3.3.5 = 3.3.5a.12340, cata classic = 4.4.2.60895)
tomlooman / ActionRoguelike
Project Orion - Co-op Action Roguelike in Unreal Engine C++
citizenfx / fivem
The source code for the Cfx modification frameworks, such as FiveM and RedM, as well as FXServer.
Warzone2100 / warzone2100
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+
widelands / widelands
Widelands is a free, open source real-time strategy game with singleplayer campaigns and a multiplayer mode. The game was inspired by Settlers II™ (© Bluebyte) but has significantly more variety and depth to it.
mas-bandwidth / yojimbo
A network library for client/server games written in C++
JACoders / OpenJK
Community effort to maintain and improve Jedi Academy (SP & MP) + Jedi Outcast (SP only) released by Raven Software
multitheftauto / mtasa-blue
Multi Theft Auto is a game engine that turns Grand Theft Auto: San Andreas into networked multiplayer.
Cockatrice / Cockatrice
A cross-platform virtual tabletop for multiplayer card games
TeamHypersomnia / Hypersomnia
Multiplayer top-down shooter made from scratch in C++. Web version: https://play.hypersomnia.io Made in 🇵🇱
tiltedphoques / TiltedEvolution
Skyrim mod to play online!
freeorion / freeorion
Source code repository of the FreeOrion project.
HerculesWS / Hercules
Hercules is a collaborative software development project revolving around the creation of a robust massively multiplayer online role playing game (MMORPG) server package. Written in C, the program is very versatile and provides NPCs, warps and modifications. The project is jointly managed by a group of volunteers located around the world as well as a tremendous community providing QA and support. Hercules is a continuation of the original Athena project.
pokerth / pokerth
PokerTH is a poker game written in C++/Qt.
openmultiplayer / open.mp
Open Multiplayer, a multiplayer mod fully backwards compatible with SA-MP
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)
mmatyas / supermariowar
A fan-made multiplayer Super Mario Bros. style deathmatch game
YomotsuHisami / eagler-touhou
An initiative to bring official Touhou Project games, spin-offs, and fan games to every platform.
DomazinUS / RaceWave46
An AI-assisted Wave Race 64 recompilation for Windows, with modern graphics and expanded local multiplayer.
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.
linkssy2 / RoadRash64Recompiled
Unofficial Road Rash 64 PC recompilation with 60 FPS presentation, MAX LOD, widescreen, custom music and experimental multiplayer. Requires your own ROM.
open-annihilation / open-annihilation
Open Source port of the Total Annihilation & TA: Kingdoms engines.
Nexus-Environment-Tech / WARDOGS-Ultimate-Trainer-Collection
🐕 Ultimate trainer & mod collection for WARDOGS. God Mode, Infinite Ammo, Unlimited Money, Stealth Mode, Perfect Accuracy, and more. Memory-only, no file modifications. Single-player practice only. NOT for online multiplayer. Steam 2026.
WitherBlitz / NSMB-Wii-Multiplayer-Recompilation
New Super Mario Bros. Wii running natively on Android and Windows: a static recompilation built on WiiCompiled. Bring your own game.
CodeNameMeteor / mecmp
Multiplayer Mod for Mirror's Edge Catalyst
emerald194520350-alt / spore-multiplayer-mod
Two-window cooperative multiplayer mod for SPORE Galactic Adventures