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

  • Enterprise-grade ITSM, for every business Icon
    Enterprise-grade ITSM, for every business

    Give your IT, operations, and business teams the ability to deliver exceptional services—without the complexity.

    Freshservice is an intuitive, AI-powered platform that helps IT, operations, and business teams deliver exceptional service without the usual complexity. Automate repetitive tasks, resolve issues faster, and provide seamless support across the organization. From managing incidents and assets to driving smarter decisions, Freshservice makes it easy to stay efficient and scale with confidence.
    Try it Free
  • MongoDB Atlas runs apps anywhere Icon
    MongoDB Atlas runs apps anywhere

    Deploy in 115+ regions with the modern database for every enterprise.

    MongoDB Atlas gives you the freedom to build and run modern applications anywhere—across AWS, Azure, and Google Cloud. With global availability in over 115 regions, Atlas lets you deploy close to your users, meet compliance needs, and scale with confidence across any geography.
    Start Free
  • 1
    Data Crow

    Data Crow

    The ultimate cataloguer

    Data Crow allows you to use the standard movie & video (divx, xvid, DVD, Blu-ray, etc), book (and eBooks), images, board games, comic books, games & software, music (mp3 and other music files) cataloguing modules. Besides these modules, which you can change to fit your requirements, you can create new modules (want to catalogue your stamps, equipment, or anything else?). The GUI is skinnable. Reporting (using JasperReports and their community edition JasperSoft Developer Studio ), loan administration, item importing & exporting, backup & restore and many other optional features are waiting for you.
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    Downloads: 281 This Week
    Last Update:
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  • 2
    Game Extractor

    Game Extractor

    Open and edit the archive files used in over 5200 games.

    Reads and writes archives used in many popular games. Great for mod development and game translations. Supports over 5200 games, with more games added through small plugins. Also shows file previews and converts them to different formats.
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    Downloads: 336 This Week
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  • 3
    Nesoid

    Nesoid

    NES emulator for Android phones

    This project is based on sources, published by original Nesoid developer, who in turn used code of GPFCE, forked from FCEUltra, currently incarnation of which is known as FCEUX. Help and suggestions are welcome. This project has been abandoned in favor of the RetroArch, another awesome free software emulator (which has much better NES support and is more actively developed): http://www.libretro.com/.
    Downloads: 26 This Week
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  • 4
    Roblox Auto Clicker & Macro

    Roblox Auto Clicker & Macro

    Roblox but have auto clicker. Don't waste your time for click.

    Free auto clicker for Roblox. You don't need to click manually, let us do it for you. This program made by UfukGames and supporting 3 languages (Türkçe,Deutsch, English). You can use this program as an macro also. This program scanned before published.
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    Downloads: 35 This Week
    Last Update:
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  • Find Hidden Risks in Windows Task Scheduler Icon
    Find Hidden Risks in Windows Task Scheduler

    Free diagnostic script reveals configuration issues, error patterns, and security risks. Instant HTML report.

    Windows Task Scheduler might be hiding critical failures. Download the free JAMS diagnostic tool to uncover problems before they impact production—get a color-coded risk report with clear remediation steps in minutes.
    Download Free Tool
  • 5
    Neko Project II for Android

    Neko Project II for Android

    PC-98 emulator for Android phones

    This project is based on sources, published by someone with nickname sawada, who used code of Neko Project II. Help and suggestions are welcome.
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    Downloads: 59 This Week
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  • 6
    LocoNet over TCP
    Client-server based software that talks to Digitrax LocoNet. TCP server talks through a hardware interface (e.g. LocoBuffer) to LocoNet. (User interface) clients talk to that server.
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    Downloads: 51 This Week
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  • 7
    Alternative Lineage 2 Game Server written in Java.
    Downloads: 20 This Week
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  • 8
    GameBoid

    GameBoid

    Gameboy Advance emulator for Android phones

    This project is based on sources published by original GameBoid developer, who in turn used code of gpSP2X, based on gpSP. Help and suggestions are welcome. This project is abandoned in favor of RetroArch: http://www.libretro.com/. Seriously, check that one out!
    Downloads: 22 This Week
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  • 9
    The Neverhood Restoration
    Be warned this project was discontinued in 2013 and has not been updated in years.
    Downloads: 17 This Week
    Last Update:
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  • AI-generated apps that pass security review Icon
    AI-generated apps that pass security review

    Stop waiting on engineering. Build production-ready internal tools with AI—on your company data, in your cloud.

    Retool lets you generate dashboards, admin panels, and workflows directly on your data. Type something like “Build me a revenue dashboard on my Stripe data” and get a working app with security, permissions, and compliance built in from day one. Whether on our cloud or self-hosted, create the internal software your team needs without compromising enterprise standards or control.
    Try Retool free
  • 10
    MobileZX is a 48k ZX Spectrum emulator for mobile devices with support for J2ME MIDP2.0. It is oriented to devices such as PDAs and mobile phones.
    Downloads: 4 This Week
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  • 11
    A Java-based Commodore 64 emulator for mobile devices and PCs. If you want to see the old C64 become alive on your mobile phone or PC then try this emulator. For more information see the Wiki pages http://sourceforge.net/apps/mediawiki/jmec64/index.php.
    Downloads: 3 This Week
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  • 12
    Minecraft (Linux)

    Minecraft (Linux)

    Minecraft launcher

    Downloads: 7 This Week
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  • 13
    Dioscuri is an x86 computer hardware emulator written in Java. It is designed by the digital preservation community to make sure that documents and programs from the past can still be accessed in the future. Dioscuri is durable and component-based.
    Downloads: 3 This Week
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  • 14
    JMStella is a J2ME Atari 2600 VCS emulator based upon JStella 0.95. It allows one to play Atari 2600 games on a java-enabled mobile phone.
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    Downloads: 1 This Week
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  • 15
    Downloads: 3 This Week
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  • 16
    Mario is a Nintendo® GameBoy emulator for PalmOS, Java, Java Micro Edition (J2ME), Microsoft Windows, Mac OS X, Linux, and POSIX platforms.
    Downloads: 3 This Week
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  • 17
    Driver support for 3D Controller Hardware. We hope to support SDL Input, DirectInput, and other major controller API's including game consoles and embedded systems.
    Downloads: 2 This Week
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  • 18
    GBCoid

    GBCoid

    Gameboy and Gameboy Color emulator for Android phones

    This project is based on sources published by original GBCoid developer, who in turn used code of gnuboy. Help and suggestions are welcome. This project has been abandoned in favor of RetroArch, another awesome free software console emulator (which is also actively developed): http://www.libretro.com/.
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    Downloads: 1 This Week
    Last Update:
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  • 19
    Horizon's Macro

    Horizon's Macro

    Don't click by yourself. Let us do it for you. 15 CPS guarantee.

    With this application you will save lots of time. It's free forever. No need to optimize like other macro applications. This program made by: UfukGames
    Downloads: 1 This Week
    Last Update:
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  • 20
    A simple but effective romrenamer written in Java. Runs on Linux and Windows and comes with a bundled installer. Reads NDS, RAR and Zipfiles Can extract directly to NDS or Zipfile. Datasource is provided as XMLFile from http://www.advanscene.com/
    Downloads: 1 This Week
    Last Update:
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  • 21
    aScanmem

    aScanmem

    game cheater for Android

    aScanmem is Android frontend for scanmem game hacking utility. Scanmem is a Linux cheating tool acting also as debugger / memory editor with support for viewing memory regions watching and repeatedly setting values in chosen address space.
    Downloads: 1 This Week
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  • 22
    This is a java version of the famous fortune game from BSD. I am writing this program in java so that people can have a platform independent version of this great utility. I am also hoping to add some features and make jfortune fun to use.
    Downloads: 1 This Week
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  • 23
    OAS is an application server for building online, cross-platform, multiplayer/user game applications and provides developers with a framework for handling client/server communication, handling and executing application logic, and multiple client types.
    Downloads: 1 This Week
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  • 24
    SuperLauncher is an alternative launcher for Minecraft
    Downloads: 1 This Week
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  • 25
    Xbpad

    Xbpad

    Xbpad - Use your xbox pad as keyboard and mouse.

    With Xbpad, you can use an Xbox 360® controller to surf the web and play games and music on your PC. It's a comfortable alternative to the keyboard and mouse. Using Xbpad with a wireless controller means you don't need to sit by your computer. You can control your music player wirelessly. You can also connect your computer to your TV and browse the web wirelessly using your controller. Xbpad lets you use a comfortable controller instead of the mouse and keyboard. If you find clicking a mouse difficult, squeezing a controller trigger might be a good alternative. If you need to stay away from the keyboard, you might like to try Xbpad instead. Download: Choose between application bundled with JRE or without. Github: https://github.com/ddwreczycki/Xbpad64 https://github.com/ddwreczycki/Xbpad32 Softpedia reviews: http://www.softpedia.com/get/System/System-Miscellaneous/Xbpad.shtml
    Downloads: 1 This Week
    Last Update:
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