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

  • Haiku

    Free Haiku Website

    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.


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  • hello System

    Free BSD FreeBSD Website

    Desktop system for creators with focus on simplicity, elegance, and usability. Based on FreeBSD. Less, but better!.


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  • ReactOS

    Free Windows FreeDOS Website

    ReactOS™ is an Open Source effort to develop a quality operating system that is compatible with applications and drivers written for the Microsoft® Windows™ NT family of operating systems (NT4, 2000, XP, 2003, Vista, Seven).

    The ReactOS project, although currently focused on Windows Server 2003 compatibility, is always keeping an eye toward compatibility with Windows Vista and future Windows NT releases.

    The code of ReactOS is licensed under GNU GPL 2.0.

    ReactOS is currently an Alpha quality operating system. This means that ReactOS is under heavy development, things may not work well and it can corrupt the data present on your hard disk. It is recommended to test ReactOS on a virtual machine or on a computer with no sensitive or critical data!


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  • FreeDOS

    Free Windows Linux Website

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

    FreeDOS can be used to play classic DOS games, run legacy business software, or develop embedded systems. Any program that works on MS-DOS should also run on FreeDOS.

    FreeDOS includes many modern features not found in MS-DOS, or features that are significantly improved from MS-DOS. These features include:

    Multi-boot with Windows, including Windows 95 - Windows 2003, Windows NT, Windows XP, and Windows ME
    FREECOM command line shell
    7ZIP and InfoZip ZIP/UNZIP file archive programs
    ARACHNE graphical web browser and email client
    CD-ROM support with XCDROM and SHSUCDX (similar to MSCDEX)
    CUTEMOUSE mouse driver with scroll wheel support
    EDIT and SETEDIT multi-window text editors
    FAT32 file system support
    FDAPM power management: APM info/control/suspend/poweroff, ACPI throttle, HLT energy saving
    FDAV anti-virus and virus scanner
    FDNPKG package manager, with network support
    GRAPHICS prints to ESC/P, HP PCL and PostScript printers
    HTMLHELP help viewer
    JEMM386 (XMS, EMS) memory manager
    32-bit protected mode drivers as JLMs (JEMM Loadable Modules)
    LBACACHE disk cache
    LBA large disk support
    LFN support via DOSLFN driver
    MPXPLAY media player: mp3, ogg, wmv with built-in AC97 and SB16 drivers
    PG text viewer (similar to LIST)
    Several utilities ported from Linux thanks to DJGPP
    UDMA drivers for hard disks and DVD drives: XDMA & XDVD


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  • LineageOS

    Free Android Android Tablet Website

    A free and open-source operating system for smartphones and tablet computers, based on the Android mobile platform. It is the successor to the highly popular custom ROM CyanogenMod, from which it was forked in December 2016 when Cyanogen Inc. announced it was discontinuing development and shut down the infrastructure behind the project. Since Cyanogen Inc. retained the rights to the Cyanogen name, the project rebranded its fork as LineageOS.

    LineageOS was officially launched on December 24, 2016, with the source code available on GitHub. Since that time, LineageOS has been described as highly popular and forcibly developed; within 4 months from the initial announcement, LineageOS development builds covered more than 160 models of phone, and over a million users, having doubled its user base in the month February–March 2017.


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  • Redox

    Free Linux Website

    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.


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  • FreeBSD

    Free BSD Self-Hosted Website

    FreeBSD is an operating system used to power modern servers, desktops, and embedded platforms.


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  • AROS

    Free AROS Website

    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, unlike UAE), while improving on it in many areas. The source code is available under an open source license, which allows anyone to freely improve upon it.


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  • Serenity OS

    Free Self-Hosted Website

    Serenity is a graphical 32-bit Unix-like operating system with 90s aesthetics and built for x86 systems.


    • Pre-emptive multitasking
    • Multithreading
    • Compositing window server
    • IPv4 networking with ARP, TCP, UDP and ICMP
    • ext2 filesystem
    • Unix-like libc and userland
    • Shell with pipes and I/O redirection
    • Visual GUI design tool
    • PNG format support
    • Text editor
    • IRC client
    • DNS lookup


    Serenity OS icon

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