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

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  • 1
    BungeeCord

    BungeeCord

    BungeeCord, the 6th in a generation of server portal suites

    BungeeCord is a Minecraft server proxy designed to connect multiple Minecraft servers into one larger network. It lets players move between separate servers while experiencing them as part of the same connected environment. The project is maintained by SpigotMC and has long been used by server owners who operate lobby, minigame, survival, creative, and specialized game-mode networks. BungeeCord works as a layer between players and backend servers, forwarding connections and managing server-to-server transitions. It also provides an API that developers can use to create plugins and extend proxy behavior. Its main value is helping Minecraft communities scale beyond a single server while keeping navigation smoother for players.
    Downloads: 10 This Week
    Last Update:
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  • 2
    MotorAssistance

    MotorAssistance

    Aim assistance for blocks and mobs

    AimAssistanceMod is a Minecraft modification that provides aim assistance for interacting with blocks and mobs. It is particularly beneficial for players using controllers or those with disabilities, as it enhances the gameplay experience without offering any advantage in player-versus-player (PvP) scenarios. The mod is fully configurable, allowing users to tailor the assistance to their preferences.
    Downloads: 10 This Week
    Last Update:
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  • 3
    ViaVersion

    ViaVersion

    Allows the connection of newer clients to older server versions

    Allows the connection of higher client versions to lower server versions - it works on any platform you can think of. The base ViaVersion jar runs on Paper and Velocity. We also have projects integrating ViaVersion to run on Fabric, Forge, Bungee, Sponge, or as a standalone proxy to join from basically any client version on any server version from the past decade. See HERE for an overview of the different Via* projects. Note that ViaVersion will be able to run best on either Paper servers or through ViaFabricPlus due to having direct access to client/server state and more extensive API.
    Downloads: 10 This Week
    Last Update:
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  • 4
    minecraft-world-downloader

    minecraft-world-downloader

    Download Minecraft worlds, extend server's render distance. 1.12.2

    A Minecraft world downloader that works as a proxy server between the client and the server to read & save chunk data. Download multiplayer worlds by connecting to them and walking around. Chunks can be sent back to the client to extend the render distance.
    Downloads: 8 This Week
    Last Update:
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  • 5

    yogpstop Minecraft Mods

    My minecraft mods development base

    yogpstop's minecraft(bukkit) mods is release in here. I'm japanese. Blog is maybe Japanese. And I'm not well at English. Please be advised. But you can post to discussion and tickets at English. Of course, reply written in English. And it isn't machine translation.
    Downloads: 99 This Week
    Last Update:
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  • 6
    BlueMap

    BlueMap

    A Minecraft mapping tool that creates 3D models of your Minecraft

    BlueMap is a program that reads your Minecraft world files and generates not only a map, but also 3D models of the whole surface. With the web app you then can look at those in your browser and basically view the world as if you were ingame! Or just look at it from far away to get an overview. BlueMap comes as a Spigot/Paper or Sponge Plugin, as a Fabric or Forge-Mod and you can also use BlueMap without any Server from the Command-Line as a standalone tool. If installed as a Plugin/Mod, BlueMap renders asynchronously to your MinecraftServer-Thread. This means at no time it will block your server thread directly. So as long as your CPU is not fully utilized, your server should not be slowed down while BlueMap is rendering.
    Downloads: 6 This Week
    Last Update:
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  • 7
    Botania

    Botania

    A tech mod for Minecraft themed around the magic of nature

    Botania is a Minecraft tech mod themed around natural magic. It's inspired by other magic mods, such as Thaumcraft or Blood Magic. With an original aim- and timing-based power system, Botania has a very different feel from your typical magic or tech mod. Manipulating Mana and watching it flow in real time adds a new light to your base of operations. Botania works within the Minecraft world itself; no GUIs are used to interact with any of its features. It's carefully designed to ensure that nearly everything is fully automatable using vanilla and itself. After some thought, of course. The Lexica Botania is the compendium of nearly all knowledge about this mod. Easily craftable in-game using a book and a sapling, it gives you almost all the information you'll ever need to know about Botania.
    Downloads: 6 This Week
    Last Update:
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  • 8
    Iris

    Iris

    A modern shaders mod for Minecraft compatible with existing OptiFine

    Iris was created to fill a void that I saw in the Minecraft customization and graphical enhancement community: the lack of an open-source shaders mod that would let me load my favorite shader packs on modern versions of the game, while retaining performance and compatibility with modpacks. OptiFine, the current dominant mod for loading shader packs, has restrictive licensing that firmly stands in the way of any sort of tinkering, and is fairly notorious for having compatibility issues with the mods that I like. It's also mutually incompatible with Sodium, the best rendering optimization mod in existence by a large margin. ShadersMod was never updated past 1.12, and it lacks support for many of the many modern popular shaderpacks. So I created Iris, to try and solve these issues, and also address many other longstanding issues with shader packs. I first and foremost develop Iris to meet my own needs of a performance-oriented shaders mod with good compatibility.
    Downloads: 6 This Week
    Last Update:
    See Project
  • 9
    Slimefun 4

    Slimefun 4

    A unique Spigot/Paper plugin that looks and feels like a modpack

    A Minecraft plugin adds hundreds of new features, such as advanced machines and magic, to enhance vanilla gameplay.
    Downloads: 6 This Week
    Last Update:
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  • 10
    Starlight Fabric

    Starlight Fabric

    Rewrites the light engine to fix lighting performance

    Starlight is a performance optimization project for Minecraft that completely rewrites the game’s internal lighting engine to improve efficiency and reduce lighting-related lag. The original Minecraft lighting system can be computationally expensive when generating terrain or updating large structures, which can cause performance problems on servers and heavily modded environments. Starlight replaces this system with a redesigned algorithm that processes lighting calculations more efficiently and reduces the number of updates required for each chunk. The project aims to improve chunk generation performance, reduce lag spikes, and eliminate certain lighting bugs that occur in the vanilla engine. Because it fundamentally replaces the default lighting system, Starlight can significantly improve performance on servers handling large numbers of block updates or terrain generation tasks.
    Downloads: 6 This Week
    Last Update:
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  • 11
    The program for creating and modifying Minecraft maps.
    Downloads: 151 This Week
    Last Update:
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  • 12
    GrimAC

    GrimAC

    Fully async, multithreaded, predictive, open source, 3.01 reach

    GrimAC is an open-source anticheat system designed to detect and prevent cheating on Minecraft multiplayer servers through predictive simulation and advanced movement analysis. The project uses a simulation-based detection engine that recreates player movement and physics in order to identify discrepancies between legitimate gameplay and modified client behavior. By analyzing how players move, interact with the world, and send network packets to the server, Grim can detect a variety of cheats such as reach hacks, speed hacks, and anti-knockback modifications. The software is designed to operate asynchronously and with multithreaded processing, allowing servers to maintain high performance even when monitoring large numbers of players simultaneously. Grim supports a wide range of Minecraft versions and can integrate with server platforms used in competitive or large multiplayer environments.
    Downloads: 5 This Week
    Last Update:
    See Project
  • 13
    Purpur

    Purpur

    Purpur is a drop-in replacement for Paper servers

    Purpur is an open-source Minecraft server software built as a fork of the Paper server platform, designed to provide extensive configurability and gameplay customization for server administrators. It functions as a drop-in replacement for Paper, meaning existing servers can switch to Purpur without major changes while gaining access to additional features and configuration options. The project focuses on allowing administrators to modify gameplay mechanics, behaviors, and rules that are normally fixed in standard server implementations. Through a wide set of configuration settings, server operators can adjust how mobs behave, alter game mechanics, or enable experimental gameplay features that are not present in vanilla Minecraft. Purpur inherits performance improvements and plugin compatibility from the Paper ecosystem while adding its own enhancements and customization capabilities.
    Downloads: 4 This Week
    Last Update:
    See Project
  • 14
    Luck Perms

    Luck Perms

    A permissions plugin for Minecraft servers

    LuckPerms is a widely used open-source permissions management plugin for Minecraft servers that allows administrators to control what actions players can perform within the game. The plugin provides a flexible system for creating user groups, assigning permissions, and defining roles that determine access to commands, features, and gameplay mechanics. Designed for performance and scalability, LuckPerms can handle large multiplayer servers and complex permission hierarchies while maintaining fast response times. Administrators can configure permissions using command-line tools, configuration files, or a web-based editor that simplifies management of large permission systems. The plugin also supports multiple storage backends such as local files, SQL databases, and other data systems, allowing server networks to synchronize permissions across multiple servers.
    Downloads: 3 This Week
    Last Update:
    See Project
  • 15
    Mohist

    Mohist

    Minecraft Forge Hybrid server implementing the Spigot/Bukkit API

    MohistMC is dedicated to pushing boundaries by accomplishing the impossible through the creation of unique hybrid Minecraft software. Additionally, we strive to maintain and enhance select mods and plugins, aiming to provide players with an exceptional gaming experience.
    Downloads: 3 This Week
    Last Update:
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  • 16
    JAIMBot is a modular architecture for providing services through an AIM client. It contains a generic AIM library and a Bot which uses this library to provide such services as Offline Messaging, Lists, Weather, Headlines, Stock Quotes, AI chatterbot.
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    Downloads: 80 This Week
    Last Update:
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  • 17
    SpongeForge

    SpongeForge

    A Forge mod that implements SpongeAPI

    A Forge implementation of the Sponge API. SpongeForge uses Gradle as its build system. The repo includes the Gradle wrapper that will automatically download the correct Gradle version. Local installations of Gradle may work but are untested. To execute the Gradle wrapper, run the ./gradlew script on Unix systems or only gradlew on Windows systems. In order to build SpongeForge you simply need to run the gradlew command. On Windows systems you should run gradlew instead of ./gradlew to invoke the Gradle wrapper. SpongeForge is the implementation of the Sponge API on the Minecraft Forge platform. Recommended for running plugins together with Forge mods. The purpose of the Sponge project is to create a plugin development framework for Minecraft: Java Edition. Sponge is being created by a global community, and its open-source nature means anyone can participate.
    Downloads: 2 This Week
    Last Update:
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  • 18
    Tweaked

    Tweaked

    Just another ComputerCraft fork

    Tweaked is a mod for Minecraft that adds programmable computers, turtles and more to the game. A fork of the much-beloved ComputerCraft, it continues its legacy with improved performance and stability, along with a wealth of new features. Tweaked can be installed from CurseForge or Modrinth. It runs on both Minecraft Forge and Fabric.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 19
    DynamicClient (Minecraft)

    DynamicClient (Minecraft)

    A Hack Client created from curseforge creators since 2021

    Dynamic Client is a minecraft hacked client that improve's the experience of the player, It has mods that was used for testing anti-cheats of servers but we changed it to be hacked client because making a client just to test anti-cheats is Boring. Announcement: 1.9.11 has been released! NOTE: This requires you to have a Minecraft launcher such as TLauncher to use the hack client. it also shows how anyone can create their own client, without coding as you only need ac-credit the mod creators. Having Issues? Check the installation Guide > https://sites.google.com/view/dynamic-client/about/installation?authuser=0 Website > https://sites.google.com/view/dynamic-client Github > https://github.com/JamStudios/DynamicClient Gitlab > https://gitlab.com/JamStudiosCorp/dynamicclient/DynamicClient
    Downloads: 53 This Week
    Last Update:
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  • 20
    DiscordSRV

    DiscordSRV

    Discord bridging plugin for block game

    A plugin that links Minecraft servers to Discord channels, providing chat synchronization and notifications between both platforms.
    Downloads: 1 This Week
    Last Update:
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  • 21
    ImmersiveEngineering

    ImmersiveEngineering

    Wires, transformers, high voltage

    A Minecraft mod that introduces a range of machines and tools inspired by industrial technology.
    Downloads: 1 This Week
    Last Update:
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  • 22
    Phosphor (for Fabric)

    Phosphor (for Fabric)

    A Fabric mod designed to improve the performance of Minecraft

    Phosphor is a free and open-source Minecraft mod (under GNU GPLv3) aiming to save your CPU cycles and improve performance by optimizing one of Minecraft's most inefficient areas-- the lighting engine. It works on both the client and server and can be installed on servers without requiring clients to also have the mod. The mod is designed to be as minimal as possible in the changes it makes, and as such, does not modify the light model or interfaces of vanilla Minecraft. Because of this, Phosphor should be compatible with many Minecraft mods (so long as they do not make drastic changes to how the lighting engine works.) If you've ran into a compatibility problem, please open an issue.
    Downloads: 1 This Week
    Last Update:
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  • 23

    Thermos

    MinecraftForge Server Software implementing the Spigot/Bukkit API

    Minecraft Forge Server Software implementing the Spigot/Bukkit API, formerly known as Cauldron/MCPC.
    Downloads: 15 This Week
    Last Update:
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  • 24
    Minecraft (Linux)

    Minecraft (Linux)

    Minecraft launcher

    Downloads: 12 This Week
    Last Update:
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  • 25
    Minecraft Portable

    Minecraft Portable

    Portable Minecraft launcher for macOS

    A portable Minecraft launcher for macOS. This is the legacy Java-based Minecraft launcher. Minecraft, and the Minecraft Logo are trademarks of Mojang AB. http://mojang.com/, http://minecraft.net/
    Downloads: 12 This Week
    Last Update:
    See Project
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