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.

  • Our Free Plans just got better! | Auth0 Icon
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  • 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.
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  • 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: 145 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: 55 This Week
    Last Update:
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  • 3
    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: 22 This Week
    Last Update:
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  • 4
    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: 11 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
    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: 3 This Week
    Last Update:
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  • 6
    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: 11 This Week
    Last Update:
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  • 7

    Thermos

    MinecraftForge Server Software implementing the Spigot/Bukkit API

    Minecraft Forge Server Software implementing the Spigot/Bukkit API, formerly known as Cauldron/MCPC.
    Downloads: 11 This Week
    Last Update:
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  • 8
    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: 9 This Week
    Last Update:
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  • 9

    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: 1 This Week
    Last Update:
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  • Cloud data warehouse to power your data-driven innovation Icon
    Cloud data warehouse to power your data-driven innovation

    BigQuery is a serverless and cost-effective enterprise data warehouse that works across clouds and scales with your data.

    BigQuery Studio provides a single, unified interface for all data practitioners of various coding skills to simplify analytics workflows from data ingestion and preparation to data exploration and visualization to ML model creation and use. It also allows you to use simple SQL to access Vertex AI foundational models directly inside BigQuery for text processing tasks, such as sentiment analysis, entity extraction, and many more without having to deal with specialized models.
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  • 10
    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: 4 This Week
    Last Update:
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  • 11
    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: 4 This Week
    Last Update:
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  • 12
    MechFight
    MechFight is a new implementation of the Amigagame Mechforce. In this tactical game groups of warriors fight with heavy machines (up to 100 tons), until defeat or even death in a thermonuclear explosion of their engines.
    Downloads: 4 This Week
    Last Update:
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  • 13
    MCSyncing to keep MC up to date.
    Downloads: 3 This Week
    Last Update:
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  • 14
    The fortbattle player replays a fortbattle of the browser game "The West" (http://www.the-west.net). It displays the battle like the ingame flash player, but you can control the speed, skip rounds and see some statistics. Ingame use req. GreaseMonk
    Downloads: 1 This Week
    Last Update:
    See Project
  • 15
    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
  • 16
    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
  • 17
    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: 2 This Week
    Last Update:
    See Project
  • 18
    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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  • 19
    Planetmule
    Free-to-play multiplayer version of the 8-bit classic M.U.L.E.
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    Downloads: 1 This Week
    Last Update:
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  • 20
    Web Based Travian Companion T3.5 helps us one-on-one when we plays the Travian game. It will relieve us from waiting for a task to come. We focus on designing and pursuing the strategic goals, and sleep well in the night. T3.5 is a stable product.
    Downloads: 1 This Week
    Last Update:
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  • 21
    This is new reincarnation of all-known xNova project. In the "Regenesis" we want to summarize all best from space-MMRPGs such like Unificant Wars and OGame. All development is carried out with Java (Hibernate + J2EE) + Haxe + ExtJS.
    Downloads: 1 This Week
    Last Update:
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  • 22
    AirPirates

    AirPirates

    Steampunk airplanes dogfighting with zeppelins

    AirPirates - Krazy Kraut is the latest campaign in a steampunk dieselpunk teslapunk setting with amazing airplanes fighting zeppelins.
    Downloads: 0 This Week
    Last Update:
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  • 23
    Multiplayer game based on the open free game http://www.fortressfigures.com/zombieplague/. Server implemented with twisted framework and client will use android
    Downloads: 0 This Week
    Last Update:
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  • 24
    Arcanium
    Arcanium is a fantasy multiplayer realtime strategy game. It has been developed as a student project at university and is now an open source project.
    Downloads: 0 This Week
    Last Update:
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  • 25
    A turn-based, 4X strategy game with some real-time tactical and also role playing aspects. I've been planning this game on paper for years and am now starting to code (Jan. '11)
    Downloads: 0 This Week
    Last Update:
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