Interesting FOSS OS that aren't Windows® or GNU/Linux

This list contains #FOSS operating systems that I find interesting. (yes, Windows® is not FOSS, everybody knows that)

"Windows®" refers to every Windows/NT #OperatingSystem owned by Microsoft, like XP and 7. React OS wants to be compatible with the Windows/NT API to a binary level but it is not a property of Microsoft.

GNU/Linux is Linux combined with software such as x11/wayland and gtk/KDE. Arch, fedora and Ubuntu are GNU/Linux but Lineage OS isn't.

lt
lounes-tbList by lounes-tb, last updated 
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  1. Haiku icon
     Like

    Haiku is an open-source operating system that specifically targets personal computing. Inspired by the BeOS, Haiku is fast, simple to use, easy to learn and yet very powerful.

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Haiku
    • Self-Hosted
    Haiku screenshot 1
    Haiku screenshot 1
    Haiku screenshot 2
    +7
    Haiku screenshot 3
  2. Desktop system for creators with focus on simplicity, elegance, and usability. Based on FreeBSD. Less, but better!

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • BSD
    • FreeBSD
  3. ReactOS icon
     Like

    ReactOS™ is a FOSS effort to develop a quality operating system based on the architecture of Microsoft® Windows™ NT family of operating systems, that is compatible with applications and drivers written for it (NT4, 2000, XP, 2003, Vista, 7).

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Windows
    • ReactOS
    ReactOS screenshot 1
    ReactOS screenshot 1
    ReactOS screenshot 2
    +23
    ReactOS screenshot 3
  4. FreeDOS icon
     Like

    FreeDOS is a complete, free, 100% MS-DOS compatible operating system. Works on old hardware, in DOS emulators, and in embedded systems.

    Cost / License

    • Free
    • Open Source

    Platforms

    • Windows
    • Linux
    FreeDOS screenshot 1
    FreeDOS screenshot 1
    FreeDOS screenshot 2
  5. LineageOS icon
     Like

    Free and open-source Android-based OS for smartphones and tablets that enables deep customization, regular security updates, privacy focus, and broad device compatibility.

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Android
    • Android Tablet
    Homescreen
    Notification Shade
    Settings
  6. Redox icon
     Like

    Redox is a Unix-like Operating System written in Rust, aiming to bring the innovations of Rust to a modern microkernel and full set of applications.

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Linux
    Redox OS running COSMIC Editor
    Redox screenshot 1
    Redox screenshot 2
    +1
    Redox running Orbital
  7. FreeBSD icon
     Like

    FreeBSD is an operating system used to power modern servers, desktops, and embedded platforms. A large community has continually developed it for more than thirty years. Its advanced networking, security, and storage features have made FreeBSD the platform of choice for many of...

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • BSD
    • Self-Hosted
    FreeBSD screenshot 1
    FreeBSD screenshot 1
  8. AROS icon
     Like

    The AROS Research Operating System is a lightweight, efficient, and flexible desktop operating system, designed to help you make the most of your computer. It's an independent, portable and free project, aiming at being compatible with AmigaOS at the API level (like Wine...

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • AROS
    AROS screenshot 1
    AROS screenshot 1
    AROS screenshot 2
    +66
    AROS screenshot 3
  9. Serenity is a graphical 32-bit Unix-like operating system with 90s aesthetics and built for x86 systems.

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Self-Hosted
    SerenityOS screenshot 1
    SerenityOS screenshot 1
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Gu