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

  • Zenflow- The AI Workflow Engine for Software Devs Icon
    Zenflow- The AI Workflow Engine for Software Devs

    Parallel agents. Multi-agent orchestration. Specs that turn into shipped code. Zenflow automates planning, coding, testing, and verification.

    Zenflow is the AI workflow engine built for real teams. Parallel agents plan, code, test, and verify in one workflow. With spec-driven development and deep context, Zenflow turns requirements into production-ready output so teams ship faster and stay in flow.
    Try free now
  • Our Free Plans just got better! | Auth0 Icon
    Our Free Plans just got better! | Auth0

    With up to 25k MAUs and unlimited Okta connections, our Free Plan lets you focus on what you do best—building great apps.

    You asked, we delivered! Auth0 is excited to expand our Free and Paid plans to include more options so you can focus on building, deploying, and scaling applications without having to worry about your security. Auth0 now, thank yourself later.
    Try free now
  • 1
    TripleA Maps

    TripleA Maps

    A collection of all maps and games made for the TripleA game engine

    http://www.triplea-game.org/
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    Downloads: 239 This Week
    Last Update:
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  • 2
    Crossfire RPG game

    Crossfire RPG game

    Cooperative multiplayer graphical RPG and adventure game

    Crossfire is a free, open-source, cooperative multi-player RPG and adventure game. Since its initial release, Crossfire has grown to encompass over 150 monsters, 3000 areas to explore, an elaborate magic system, 14 races, 16 character classes, and many powerful artifacts scattered far and wide. Set in a fantastical medieval world, it blends the style of Gauntlet, NetHack, Moria, and Angband.
    Downloads: 42 This Week
    Last Update:
    See Project
  • 3
    MegaMek
    MegaMek is a networked Java clone of BattleTech, a turn-based sci-fi boardgame for 2+ players. Fight using giant robots, tanks, and/or infantry on a hex-based map. Development currently occurs on GitHub (see https://github.com/MegaMek). This SF page remains as a mirror and archive of the old issue trackers. The trackers are currently locked and new issues should be created on the GitHub page.
    Downloads: 14 This Week
    Last Update:
    See Project
  • 4

    Gametable

    Multi-user whiteboard emphasizing simplicity.

    Gametable (also known as GamenianTabele), is a Java-based shared whiteboard and chat client. It is designed primarily to provide an online tabletop interface. Draw directly, or place images, that all connected users can see and manipulate. RNG/dice functions supported, infinite table size, a few Z-order layers, pointer tools visible to everyone connected, stand along host server, and basic tagging and drawing tools. It specializes in simplicity, virtually no learning curve, and ease of use. Shared image files auto-propagate to other users (and only images, no other file type will propagate), which allow them to use a local cache to view shared spaces.
    Downloads: 10 This Week
    Last Update:
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  • Grafana: The open and composable observability platform Icon
    Grafana: The open and composable observability platform

    Faster answers, predictable costs, and no lock-in built by the team helping to make observability accessible to anyone.

    Grafana is the open source analytics & monitoring solution for every database.
    Learn More
  • 5
    Colossus is a Java clone of the boardgame Titan, a turn-based fantasy wargame for 2-6 players. Each player moves stacks of creatures around a strategic board, recruiting more creatures and fighting enemy stacks on tactical maps.
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    Downloads: 12 This Week
    Last Update:
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  • 6
    Panzer Combat II

    Panzer Combat II

    Computer-assisted miniature tank game.

    Panzer Combat II is a multi-player voice and webcam enabled computer-assisted distributed miniature wargame of World War II tank combat. Firing is done by placing a webcam behind the aiming unit. Distance to target is computed using computer vision. Action inside the tanks is performed on the computer screen while battlefield strategy is played on the miniature terrain. Both camps can use a different laptop or tablet, the game will interconnect. You can try it online : http://server.panzercombat.com/PCII_Web/move.htm Look at battle reports : http://www.flickr.com/photos/panzercombatii Or watch a demo : http://www.youtube.com/watch?v=WcjfV8Odtss 100% CLEAN : http://games.softpedia.com/progClean/Panzer-Combat-II-Clean-95530.html
    Downloads: 10 This Week
    Last Update:
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  • 7
    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: 4 This Week
    Last Update:
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  • 8

    Thermos

    MinecraftForge Server Software implementing the Spigot/Bukkit API

    Minecraft Forge Server Software implementing the Spigot/Bukkit API, formerly known as Cauldron/MCPC.
    Downloads: 14 This Week
    Last Update:
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  • 9
    Chess

    Chess

    A simple 2D-Chess

    A 2D-Chess with many features, such as a multiplayer server and many others. It will also show you all movement possibilites you have. Playing against Computer is in development
    Downloads: 7 This Week
    Last Update:
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  • Total Network Visibility for Network Engineers and IT Managers Icon
    Total Network Visibility for Network Engineers and IT Managers

    Network monitoring and troubleshooting is hard. TotalView makes it easy.

    This means every device on your network, and every interface on every device is automatically analyzed for performance, errors, QoS, and configuration.
    Learn More
  • 10
    Planetmule
    Free-to-play multiplayer version of the 8-bit classic M.U.L.E.
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    Downloads: 6 This Week
    Last Update:
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  • 11
    Shoddy Battle (later known as Pokémon Lab) is a Pokémon simulator created by Cathy and bearzly and first released in July 2007. It allows users to play Pokémon matches against other people online. Shoddy Battle was highly influential on the game of competitive Pokémon because it was free and open source, scalable (700,000 battles per month during its peak), user customisable and extensible, and it provided unprecedented statistical data on player skill and Pokémon usage trends. Visit the web site for more information.
    Downloads: 6 This Week
    Last Update:
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  • 12
    LandsDiscordBot

    LandsDiscordBot

    Adds Discord Functionality to Lands.

    This plugin adds Discord functionality to the spigot plugin Lands. It allows land owners to create a channel for their land so they can chat from Discord with their land members online at the Minecraft server. Also you can view top lands in Discord, receive land and war notifications and more to come.
    Downloads: 4 This Week
    Last Update:
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  • 13
    Lucky at Bingo's take at a Black Ops RCon tool. Supports kicking and banning, as well as custom map rotations for ranked servers. Provides multiple admin levels (super -admin, admin, etc.). An Android version is being developed (Lucky Rcon Lite)
    Downloads: 2 This Week
    Last Update:
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  • 14
    X-Core

    X-Core

    The original Xivio.com World Server Core

    Xivio.com was a commercial children's virtual world website created in 2006 by Gavin Conrad. This is the legacy World Server Java Core made available to the world to do with as it wishes.
    Downloads: 2 This Week
    Last Update:
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  • 15
    Minecraft Name Checker

    Minecraft Name Checker

    Minecraft Name Availability Checker

    A Minecraft tool that checks to see if an account name is available or currently taken. The program is written entirely in Java and exported to an executable. A text file (one name per line) can also be read and checked. An output file "available.txt" will be created with usable names in the same directory as the selected read file.
    Downloads: 3 This Week
    Last Update:
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  • 16
    Apozh

    Apozh

    A funny game for a good company similar to karaoke

    Apozh is a game similar to karaoke for 2 or more players. One player sings a song while the second player should not hear it, then the song is turned backwards, and the second player tries to sing it in the 'reversed' state. Once the second player finished singing, his recording is also turned backwards. Then the second player tries to guess, what was the first player's song. A sound card, microphone and speakers are required to play this game.
    Downloads: 3 This Week
    Last Update:
    See Project
  • 17
    Multiverse

    Multiverse

    Open Source Virtual World and MMOG Development Platform

    3D Client (Windows), Server, and Tools to easily create massively multiplayer games and virtual worlds. If you want to contribute to the source code please go to https://github.com/multiversemmo/MultiversePlatform
    Downloads: 1 This Week
    Last Update:
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  • 18
    Human AI Net

    Human AI Net

    a Human and Artificial Intelligence Network

    We are going to teach eachother how to build AI and new kinds of game objects in this network using intuitive dragAndDrop. Its going to be a space for experimenting with fun and useful tools in new ways. Version 0.8.0 has some advanced components that will be working soon. The plan is a massively multiplayer space where we design, evolve, and play with game objects and do AI research together which controls those game objects along with directly playing the games. The main data format is, from xorlisp which is also in progress, immutable binary forest nodes, so if millions of people build that together nobody can damage or change anyone else's data since its all constant. You dont change variables. You create new data that points at existing constant data, as deep as you need it. I have mindmap lists, definitions, and 2 editable properties working that way with 2 kinds of event listeners that work locally. Its not a networked system yet, but the datastructs are ready to scale with it.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 19
    SuperLauncher is an alternative launcher for Minecraft
    Downloads: 2 This Week
    Last Update:
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  • 20

    Bengine

    Free strategy browsergame engine.

    Galactic strategy Open Source browsergame. Replacement of the former game Net-Assault.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 21
    BlackJack-like game where you play against another player, either online or on a LAN, where the best hand wins the round. It's still developing, the new round doesn't work as it was supposed to... and many new features that will come as I improve it.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 22

    Bronze to Masters Evaluation

    Evaluates Starcraft 2 games with respect to multiple macro aspects.

    The Bronze to Masters Evaluator (B2Meval) evaluates Starcraft 2 games with respect to multiple macro aspects. These are worker and supply count at specific times, expansion timings, building timings, as well as research and upgrade timings. The B2Meval is a SC2gears plugin. Hence, SC2gears is required. The B2Meval shows specific values of unit counts and timings that are recommended by filtersc's macro tutorials. Please, refer to filtersc's macro tutorials on teaamliquid.net or YouTube.com for more information about these values.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 23
    BukkitUI

    BukkitUI

    A Simple and Easy to Use User Interface for Private Bukkit Servers

    BukkitUI is a user interface replacement for the Bukkit console. It makes life as a server owner much easier, as it requires you to press a few buttons, until you have a running server! BukkitUI is written in Java, and is designed to be cross-platform, so Linux users (like me) have as much a chance at running a Bukkit server as Windoze users. BukkitUI has following
    Downloads: 1 This Week
    Last Update:
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  • 24
    Extinction Minijeux

    Extinction Minijeux

    Extinction-minijeux.fr est une plateforme de minijeux

    Extinction-MiniJeux.fr est la nouvelle plateforme d'Extinction.fr. Retrouvez les 3 MiniJeux emblématiques : Aaaah, Bouboum et Forteresse.
    Downloads: 1 This Week
    Last Update:
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  • 25
    JayMontana36 Pre-Built Minecraft Servers

    JayMontana36 Pre-Built Minecraft Servers

    Free Minecraft Servers tweaked for a lag-free experience!

    Free Minecraft Servers that come with a few of the most popular used plugins pre-installed by default, all preconfigured for a lag-free experience! - Optimized for low-end systems (beast-like on medium to high end systems). - Low RAM usage/requirements/consumption. - CrossCompatible between many different versions of Minecraft. - One Server Supports all 1.4.x, 1.5.x, 1.6.x, 1.7.x, 1.8.x, 1.9.x, 1.10.x, 1.11.x, 1.12, 1.12.2 clients all at the same time. - Fully Supports Linux, Windows, and Mac OS X. - Officially supports the MineOS Web UI created and owned by Will Dizon (this project however, is not affiliated with the MineOS Web UI nor William Dizon).
    Downloads: 1 This Week
    Last Update:
    See Project
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