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.

  • Cut Data Warehouse Costs by 54% Icon
    Cut Data Warehouse Costs by 54%

    Easily migrate from Snowflake, Redshift, or Databricks with free tools.

    BigQuery delivers 54% lower TCO with exabyte scale and flexible pricing. Free migration tools handle the SQL translation automatically.
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    Ship Agents Faster

    Transform your applications and workflows into powerful agentic systems at global scale.

    Gemini Enterprise Agent Platform lets you rapidly build, scale, govern and optimize production-ready agents grounded in your organization's data. The platform enables developers to build custom or pre-built agents for virtually any use case. New customers get $300 in free credits.
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  • 1
    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: 56 This Week
    Last Update:
    See Project
  • 2
    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: 17 This Week
    Last Update:
    See Project
  • 3
    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: 3 This Week
    Last Update:
    See Project
  • 4
    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
    Last Update:
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  • 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.
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  • 5
    Apple Game Server 3.1

    Apple Game Server 3.1

    Upload games to legacy apple // computers via serial and no floppies!

    This java (version 6 or higher) program allows you to send games directly to an old apple // computer with no need for floppies, only a serial cable. No hardware modification is necessary, you only need a working serial connection. A cousin of this project can be found here: http://asciiexpress.net/gameserver/ (Thanks Egan!)
    Downloads: 1 This Week
    Last Update:
    See Project
  • 6
    Ataroid

    Ataroid

    Atari emulator for Android phones

    This project is based on sources published by original Ataroid developer, who in turn used code of Stella. This project is abandoned in favor of Droid2600: https://code.google.com/p/droid2600/. Available sources do not compile into anything working anyway.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 7
    I finally got around to actually coding something! This is going to be an OS for use on combat robots, complete with full support for sensors, hammers, flamethrowers, wedges, saws, and clamper robots. All weapon systems are fully customizable w/RC.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 8
    DefendLine
    Low-cost, easy to replicate GSM-based remote controlled security system capable of taking and sending pictures of a guarded site.
    Downloads: 0 This Week
    Last Update:
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