Browse free open source Java Games and projects below. Use the toggles on the left to filter open source Java Games by OS, license, language, programming language, and project status.
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Port of SDL library to Android mobile platform.
There are also several games inside the repository, along with their sources and build files.
Both SDL 1.2 and 1.3/2.0 versions are supported (1.3/2.0 support is experimental)
Sources are at https://github.com/pelya/commandergenius
Public repository of source code for the Universal Pokemon Randomizer
Universal Pokemon Randomizer ZX is an open-source tool that allows players to modify and randomize various aspects of Pokémon games across multiple generations, creating unique and unpredictable gameplay experiences. It supports a wide range of ROMs and provides a user-friendly interface for customizing game elements such as Pokémon encounters, abilities, stats, movesets, and item distributions. The tool is designed to maintain game stability while introducing variability, ensuring that randomized versions remain playable and balanced. It also includes advanced options that allow users to control the level of randomness, from subtle changes to complete overhauls of game mechanics. By enabling customization, the project extends the replay value of classic Pokémon titles and encourages experimentation with different strategies. It is widely used by the community for challenge runs, content creation, and personalized gameplay experiences.
Patch, monitor, and connect to Windows and macOS devices from one console
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LOTRO Companion is a desktop application.
It manages characters of the Lord of the Rings Online (LOTRO) MMORPG.
It has 3 main goals:
- track the status of one or several characters: current gear, deeds, quests, collections...
- simulate gear/virtues, compute result stats and analyze stats contributions
- lore database: quests, items, deeds, mounts, pets...
Character data is imported from the game client running locally.
See https://discord.gg/t2J4GDq
See https://www.facebook.com/lotrocompanion/
ZombieBuddy is an open-source Java agent framework that enables advanced modding of Project Zomboid through runtime bytecode manipulation. Built on ByteBuddy, it allows developers to modify game classes and methods without accessing or replacing the original source code. Its annotation-based API simplifies patch creation using declarative instructions. The framework automatically discovers patches and can transform classes that are already loaded. It supports method interception through advice-based and delegation-based techniques. Java classes and functions can also be exposed to Lua scripts for extended modding capabilities. Configurable logging and debugging utilities help developers inspect game behavior. ZombieBuddy supports Project Zomboid Build 42 and later, with installation options for Windows, macOS, and Linux.
Never get AFK-kicked again!
With Roblox anti-AFK you can easily: grind, farm, chill and whatever you want!
It's very easy to use. Just press "Start!", and good luck being AFK! You don't even need to have the Roblox window open. Roblox anti-AFK allows you to AFK in Roblox while you can still use your device. I hope you'll make lots of progress in your favourite simulators!
Feel free to add suggestions!
=====Version: 2.9.1=====
Requires Java to be installed to run. You can download it here if you don't have it already:
https://www.java.com/download/manual.jsp
If you have trouble opening the program, the first post may help:
https://sourceforge.net/p/roblox-anti-afk/tickets/7/?limit=25
Sodium is a powerful rendering engine and optimization mod for the Minecraft client which improves frame rates and reduces micro-stutter while fixing many graphical issues in Minecraft. A Minecraft mod designed to improve frame rates and reduce micro-stutter.
A Minecraft Launcher which is multi-functional, cross-platform
HMCL is a cross-platform Minecraft launcher that supports Mod Management, Game Customizing, ModLoader Installing (Forge, NeoForge, Fabric, Quilt, LiteLoader, and OptiFine), Modpack Creating, UI Customization, and more. HMCL has amazing cross-platform capabilities. It can not only run on different operating systems such as Windows, Linux, and macOS, but also supports multiple CPU architectures such as x86, ARM, MIPS, and LoongArch. You can easily play Minecraft on different platforms through HMCL.
Auto-discovery finds your devices and deploys pre-configured sensors instantly. No project plan required, just visibility from day one.
Waiting weeks for a monitoring rollout isn't an option when infrastructure doesn't stop running. PRTG's auto-discovery scans your network and suggests from over 200 pre-configured sensor types, so you're watching servers, applications and devices within minutes, not after a multi-week deployment. Enterprise-strength monitoring, without the enterprise complexity. Start your free trial today.
Arianne is an engine to develop multiplayer online games like Stendhal
Arianne is a multiplayer online engine to develop turn based and real time games, providing a simple way of creating the game server rules and clients like our MORPG Stendhal. Our engine Marauroa uses Java and SQL for hosting hundreds of players on a solo host.
Stendhal is a fun friendly and free multiplayer online adventure game with a huge and rich world. With hundreds of NPCs and different quests, features like the Travel log and achievement system keep track of progress. Thousands of creatures are ready to fight, above and below ground, and as players level up they can compare themselves on a detailed stats website.
The engine Marauroa provides a simple way of creating games on a portable and robust server architecture. Marauroa manages the client server communication and provides an object orientated view of the world for game developers. It handles database access in a transparent way to store player accounts, character progress and the state of the world
Make Minecraft Java Edition mods, Minecraft Bedrock Edition Add-Ons
MCreator is an open-source integrated development environment designed to simplify the process of creating Minecraft mods, add-ons, resource packs, and data packs. The software provides a visual programming environment where users can design mod features using graphical tools instead of writing code manually. Through wizards, block-based programming interfaces, and an integrated editor, MCreator generates the underlying Java or JSON code required for the mod automatically. This approach allows beginners and students to experiment with mod development without needing extensive programming experience. At the same time, advanced users can extend the tool through plugins or directly modify the generated code for more complex projects. MCreator is widely used in educational settings, modding communities, and programming workshops as a gateway into game development.
Data Crow is an open source collection manager for movies & video (DivX, MP4, MKV, etc.), TV series, books (and eBooks), images, board games, comic books, games & software, and music (MP3 and other audio files). Besides these built-in modules (which you can customise to fit your needs) you can create entirely new ones. Want to catalogue your stamps, equipment, wine, or anything else? Data Crow makes it possible.
Your collection is accessible the way you prefer: as a stand-alone desktop application, in server-client mode for shared access across multiple users or devices, via the web client in any browser, or on the go with the Data Crow Reader App. The app synchronises with your Data Crow installation and works fully offline.
Private. Offline. Completely personal. The Data Crow way.
Robocode is a programming game, where the goal is to develop a robot battle tank to battle against other tanks with Java. The robot battles are running in real-time and on-screen. The motto of Robocode is: Build the best, destroy the rest!
FreeCol is a turn-based strategy game based on the old game Colonization, and similar to Civilization. The objective of the game is to create an independent nation. You start with only a few colonists defying the stormy seas in their search for new land. Will you guide them on the Colonization of a New World?
The last stable version release can be found here:
https://sourceforge.net/projects/freecol/files/latest/download
The latest test pre-release of the next version can be found here:
https://github.com/FreeCol/freecol/releases
If you want to contribute to Freecol please visit our welcome information thread to see how here:
https://sourceforge.net/p/freecol/discussion/719661/thread/2d0063a3bc/
Create is a large Minecraft modification that introduces mechanical engineering systems, automation tools, and kinetic machinery into the game. The mod focuses on building complex contraptions powered by rotational energy rather than relying on traditional redstone circuitry alone. Players can design elaborate machines using components such as shafts, gears, belts, and mechanical devices that interact with each other to automate crafting, farming, and resource processing. Unlike many technology mods that rely heavily on graphical interfaces, Create emphasizes visible mechanical movement and physical machinery that operates directly in the game world. The mod also includes a visual documentation system called “Ponder” that demonstrates how each machine or component works through animated tutorials inside the game.
WorldEdit is a powerful open-source Minecraft map editing toolkit that allows players, builders, and server administrators to quickly modify large areas of a Minecraft world directly from within the game. Instead of placing or removing blocks individually, WorldEdit provides commands and tools that enable users to select regions of the world and apply transformations to thousands or even millions of blocks at once. This capability makes it extremely useful for constructing large builds, terraforming terrain, repairing damage, or managing multiplayer server worlds efficiently. The tool includes a variety of editing methods such as brushes, shape generation commands, and clipboard operations that allow copying, pasting, and rotating entire structures. WorldEdit can run in both single-player environments and multiplayer servers and is compatible with several modding platforms and server frameworks used in Minecraft Java Edition.
RuneLite is a free, open-source client for Old School RuneScape that enhances the gaming experience with a wide range of customizable features and plugins. It offers players advanced tools and overlays that improve gameplay, such as detailed stats tracking, map enhancements, and real-time notifications. The client is developed in Java and maintained by a large community of contributors, ensuring regular updates and bug fixes. RuneLite is designed to be lightweight and efficient, running smoothly alongside the original game client without impacting performance. It also supports easy integration with third-party APIs and offers a robust plugin framework for customization. Licensed under the BSD 2-clause license, RuneLite encourages community contributions and open collaboration.
Shattered Pixel Dungeon is a traditional roguelike dungeon crawler
Shattered Pixel Dungeon is a free, open-source roguelike dungeon crawler based on the original Pixel Dungeon game by Watabou. It features procedurally generated levels filled with monsters, traps, treasures, and challenging encounters. Players select from different hero classes, each offering distinct abilities, talents, and gameplay strategies. Its turn-based combat system emphasizes tactical decisions, resource management, and careful exploration. The game includes hundreds of weapons, armor pieces, artifacts, potions, and other collectible items. Permanent death and randomized environments make every adventure unpredictable and encourage experimentation. Available for Android, iOS, and desktop platforms, it combines traditional roguelike mechanics with detailed pixel art and extensive character progression.
This is a fabric mod that introduces a brand new Vulkan-based voxel rendering engine to Minecraft Java in order to both replace the default OpenGL renderer and bring performance improvements.
Neo Modding API for Minecraft: Java Edition, based on Forge
NeoForge is an open-source modding API and mod loader designed for Minecraft: Java Edition that enables developers to create and run game modifications within a structured development framework. The project was created as a community-driven continuation of the Minecraft Forge ecosystem and aims to provide a modernized, actively maintained platform for mod development. NeoForge includes tools, APIs, and build systems that allow developers to modify game behavior, add new gameplay mechanics, and integrate custom content into Minecraft worlds. The framework is designed to simplify the development process by offering standardized interfaces, development kits, and compatibility layers that help mod creators build complex modifications without rewriting core game code. By supporting mod development tools such as Gradle plugins and mod development kits, NeoForge allows programmers to efficiently build, compile, and distribute mods for multiple versions of Minecraft.
Sudoku generator/solver/analyzer written in Java (English and German). Lots of human style techniques (singles, subsets, LCs, fish, wings, uniqueness, coloring, chains, ALS), powerful analyzer (manage multiple solutions for one sudoku). Includes Learning and training modes and a booklet printer.
Domination is a game that is a bit like the board game Risk
Domination is a game that is a bit like the well known board game of Risk or RisiKo. It has many game options and includes many maps.
Written in java it includes a map editor, a simple map format, multiplayer network play, single player, hotseat, 5 user interfaces and many more features, it works in all OSs that run java 1.5 or higher, iOS and Android.
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