Browse free open source C++ Multiplayer Games and projects below. Use the toggles on the left to filter open source C++ Multiplayer Games by OS, license, language, programming language, and project status.

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  • 1
    BZFlag - Multiplayer 3D Tank Game
    OpenSource OpenGL Multiplayer Multiplatform Battle Zone capture the Flag. 3D first person tank game. Download the latest version at https://www.bzflag.org/downloads/ Development has moved to Github: https://github.com/BZFlag-Dev/bzflag (The SourceForge binary releases for Windows and macOS are very outdated. Please download the latest version from our website.)
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    Downloads: 3,803 This Week
    Last Update:
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  • 2
    0 A.D.

    0 A.D.

    0 A.D. is a free, open-source, cross-platform real-time strategy game.

    0 A.D. (pronounced "zero ey-dee") is a cross-platform real-time strategy (RTS) game of ancient warfare. It's a historically-based war/economy game that allows players to relive or rewrite the history of ancient civilizations, each depicted at their peak of economic growth and military prowess.
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    Downloads: 112 This Week
    Last Update:
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  • 3
    Zod Engine
    Zod Engine is a remake of the 1996 classic game by Bitmap Brothers called Z. Z is a capture the flag style RTS. In this game you command robots and vehicles with the purpose of destroying the enemy's fort. Please visit http://zzone.lewe.com/ for more
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    Downloads: 70 This Week
    Last Update:
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  • 4
    Odamex

    Odamex

    Odamex is a free, cross-platform, modern client-server Doom engine

    Odamex is a free, cross-platform (Mac, Windows, Linux) modification of the Doom engine that allows players to easily join servers dedicated to playing Doom online. The goal of Odamex is to add enhancements to Doom while still retaining that "classic Doom feel" we all know and love about the original game.
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    Downloads: 99 This Week
    Last Update:
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  • 5
    Linux Air Combat

    Linux Air Combat

    Combat Flight Simulator for LINUX. WW2. Network and VOIP. Open-source.

    WW2 Combat Flight Simulator. Free. Current Version: 9.93. This is now the world's leading open-source combat flight sim for LINUX. Linux Air Combat ("LAC") runs on almost any desktop LINUX system (even Steam Deck & Raspberry Pi) and generates smooth, high-performance flight. If it runs TOO fast on your hardware (framerates beyond 100 FPS), you should activate LAC's built-in FrameRate Limiter as documented here: https://askmisterwizard.com/2019/LinuxAirCombat/FrameRateLimiter.htm Clean, open source code provides an option to compile yourself, or use our precompiled executable AppImage to eliminate compiling on all popular X86 LINUX distros. Control flight and views with mouse and keyboard, console game controller, or joystick, all easily configured from prominent configuration menus. Learn all about LAC from our primary, official Web Page: http://askmisterwizard.com/2019/LinuxAirCombat/LacOnlineDocs.htm Recent video clip: https://youtu.be/C77C-e8axWs
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    Downloads: 58 This Week
    Last Update:
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  • 6
    OpenKore

    OpenKore

    OpenKore is an automation tool for Ragnarok Online

    OpenKore is an automation tool for Ragnarok Online-compatible games, authorized to be used on KoreRO. **MOVING TO GITHUB** As of February 28th 2016, the OpenKore project has moved to GitHub. Please see the OpenKore wiki for more information: http://openkore.com/index.php/Git This SourceForge page will remain online for now, but the project has been locked in "read-only" mode and no more updates will be published here. **DOWNLOADING KORE FROM THIS PAGE WILL GIVE YOU AN OLD VERSION**
    Downloads: 33 This Week
    Last Update:
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  • 7
    Performous

    Performous

    The All-in-One music game

    Performous is an open-source rhythm/performance platform that contains singing, guitar/bass playing, drumming and dancing all in one game.
    Downloads: 38 This Week
    Last Update:
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  • 8
    Crossfire RPG game

    Crossfire RPG game

    Cooperative multiplayer graphical RPG and adventure game

    Crossfire is a free and open-source cooperative multiplayer graphical RPG and adventure game. Set in a medieval fantasy world, it combines real-time action with traditional role-playing mechanics inspired by games such as Gauntlet, NetHack, Moria, and Angband. Players can choose from 14 races and 16 character classes, develop skills and magic, worship gods, complete quests, discover powerful artifacts, and explore thousands of interconnected maps filled with monsters, dungeons, cities, and adventures. Crossfire has been continuously developed since 1992 and remains an actively maintained community project.
    Downloads: 33 This Week
    Last Update:
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  • 9
    Kirstens Viewers

    Kirstens Viewers

    Opensource Created Custom Viewers For Virtual Worlds like SecondLife.

    Kirsten’s Viewer is a fast, modern Third‑Party Viewer (TPV) for Second Life, registered under the official TPV directory. It’s built for creators, photographers, and advanced users who want a clean, modern viewer with a focus on high performance on high end PC's Anaglyph 3D Mode , OpenCL‑based Visual Effects, Aggressive Optimisation, vcpkg + PowerShell One‑Click Build Automation, Highly Tuned Graphics Path , Many Other Cutting‑Edge Features — ongoing experimental work, performance improvements, and creator‑driven enhancements continue to push the viewer forward.
    Downloads: 29 This Week
    Last Update:
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  • 10
    AssaultCube Reloaded

    AssaultCube Reloaded

    A fun realistic multiplayer free-and-open-source first-person-shooter!

    ACR is a fun realistic multiplayer free-and-open-source first-person-shooter! This project has moved to GitHub. A mirror of releases is here.
    Downloads: 12 This Week
    Last Update:
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  • 11
    Fast 2d tank arcade game with multiplayer and split-screen modes.
    Downloads: 10 This Week
    Last Update:
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  • 12
    Egoboo

    Egoboo

    Free 3D Roguelike action RPG

    Egoboo is a working cool 3D dungeon crawling game in the spirit of nethack. Currently it is supported by Windows, Linux and Mac.
    Downloads: 10 This Week
    Last Update:
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  • 13
    Ryzom
    Ryzom Core is a toolkit for the development of massively online universes. It provides the base technologies and a set of development methodologies for the development of both client and server code.
    Downloads: 11 This Week
    Last Update:
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  • 14
    M.A.R.S. - a ridiculous Shooter
    This is a first attempt to create a game in OpenGL with SFML. It is a game for two players, flying with ships in a two-dimensional space setting, governed by the laws of gravity. There are several game modes and a lot of weapons.
    Downloads: 5 This Week
    Last Update:
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  • 15
    ZED Online

    ZED Online

    An online multiplayer real time strategy game

    A remake of the 1996 classic game Z. The project is currently in the early stages. More updates will come in the following weeks. Please visit zzone.lewe.com for more. ZED Online world rankings: https://zedonline.sourceforge.io/highscore.php See the wiki for more information: https://sourceforge.net/p/zedonline/wiki/Home/ Information on the different control styles can be found here: https://sourceforge.net/p/zedonline/wiki/controls/ Demo videos: https://www.youtube.com/watch?v=RKmKpTe-gVo https://www.youtube.com/watch?v=OnAJTml5znY https://www.youtube.com/watch?v=3UZSFsY6sSA https://www.youtube.com/watch?v=SFmoCg_F22w Online Multiplayer - Port forwarding In order to connect online the player who creates the game needs to enable port forwarding on their network router/NAT. The game will use port 8000 TCP. If the game can not bind the server to port 8000 it will try the next port until 8009. We recommend to forward all ports 8000-8009 TCP
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    Downloads: 9 This Week
    Last Update:
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  • 16
    A 2D game inspired by Gravity Power, Star Control and Super Smash Bros. Features include 4-player split-screen action, enemy AI to play missing players, 15 ships, 9 levels and plenty of fun blowing up the level and the other players to smithereens!
    Downloads: 11 This Week
    Last Update:
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  • 17
    Zero Ballistics
    Zero Ballistics is a unique blend of first person shooter and tank combat, focusing on multiplayer gaming exclusively.
    Downloads: 6 This Week
    Last Update:
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  • 18
    FLAW
    FLAW is a free top-down wizard battle game. It can be played by up to 5 players simultaneously. The goal of the game is to survive as long as possible while more and more fireballs appear in the arena. Gameplay is simple and self-explanatory. The desktop version is available on Windows and Linux - an Android port of has been made by David Lee Evans (https://github.com/DavidLeeEvans/FLAW) The game and all of its assets are licensed under the GNU General Public License Version 3 and may be modified, copied and redistributed under the terms of this license.
    Downloads: 5 This Week
    Last Update:
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  • 19
    Widelands
    Note: Widelands is now hosted by launchpad: http://launchpad.net/widelands. Historical downloads and the mailinglist remain on sf.net.
    Downloads: 3 This Week
    Last Update:
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  • 20

    Grepo-Tool

    Grepolis utility

    Map viewer and planning utility for Grepolis. The program uses freely accessible data to produce maps and allows for strategical planning of game actions. Grepolis itself is a multiplayer online game and is the intellectual property of InnoGames GmbH To install grepotool, please download the ZIP-File and unpack it into a writable directory. In addition, you may need to install OpenSSL (32-Bit version) and copy three DLLs manually into the grepotool/bin directory. Attention: To include the newest server please read the Wiki or Ticket section. You can simply update the containing server.txt file with an text editor like notepad++.
    Downloads: 5 This Week
    Last Update:
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  • 21
    2D isometric MMORPG using the SDL framework. Daimonin offers a free public server at https://www.daimonin.org . A Unity client is also in active development.
    Downloads: 2 This Week
    Last Update:
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  • 22

    Minecraft World Utility

    Converts Minecraft world files between formats to allow editing

    The Minecraft World Utility is a set of simple tools for editing Minecraft files and converting them between formats for easier editing. MCWUtil follows the principle of small tools doing one job well and gaining power from chaining many small tools together.
    Downloads: 9 This Week
    Last Update:
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  • 23
    NetJoy

    NetJoy

    Network gamepad/joystick

    Project NetJoy, comprising JoySender++ and JoyReceiver++, simplifies the process of remote joystick control and gaming experiences over a Local Area Network (LAN) or Wide Area Network (WAN). It provides a convenient solution for transmitting joystick inputs between Windows machines over UDP or TCP. This project is available in two versions: a console-based version and a version with a Textual User Interface (tUI). Versions are cross compatible. Requires latest MSVC Redistributable https://learn.microsoft.com/en-us/cpp/windows/latest-supported-vc-redist?view=msvc-170#visual-studio-2015-2017-2019-and-2022 Requires ViGEm Bus Driver for game pad emulation on host machine. https://github.com/ViGEm/ViGEmBus
    Downloads: 9 This Week
    Last Update:
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  • 24
    PK Rhythm

    PK Rhythm

    A game about hitting the beats of a song.

    PK Rhythm is a rhythm game based on Mother 3's battle combo system. Time your beats to the tempo and try to get 16-hit combos! It's still under development, but feel free to check it out.
    Downloads: 9 This Week
    Last Update:
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  • 25
    Mac Crack Attack
    Mac Crack Attack is a port of Crack Attack to the Mac OS X platform. Crack Attack is based on the Super Nintendo classic Tetris Attack. Mac Crack Attack is a fast paced "Tetris-like" game for one or two players (networked)
    Downloads: 8 This Week
    Last Update:
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