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Welcome to the page of niche operating systems. Here, you can get acquainted with niche/hobby operating systems developed in the last few decades. The majority of operating systems are sufficiently functional, a few, however, are real-mode operating systems, and some are even less developed and could be labeled as advanced boot loaders. More interesting operating systems on this page have memory management capabilities, multi-tasking capabilities, and file system support. Closed-source operating systems are omitted from this list.

  • Desktop
    AtheOS
    Author:
    Kurt Skauen
    Active since:
    Active till:
    License:
    GNU GPL
    Platforms:
    IA-32
  • TriangleOS
    TriangleOS
    Author:
    Wim Cools
    Active since:
    Active till:
    License:
    Unknown
    Platforms:
    IA-32
  • Desktop
    Visopsys
    Author:
    Andy McLaughlin
    Active since:
    Active till:
    License:
    GNU GPL, GNU LGPL
    Platforms:
    IA-32
  • Not available
    L4Ka::Hazelnut
    Author:
    University of Karlsruhe
    Active since:
    Active till:
    License:
    GNU GPL
    Platforms:
    ARM, IA-32
  • Not Available
    NewOS
    Author:
    Travis Geiselbrecht
    Active since:
    Active till:
    License:
    BSD
    Platforms:
    IA-32, Sega Dreamcast, PowerPC
  • Not available
    TinyOS
    Author:
    Jason Hill, Robert Szewczyk, Alec Woo, David Culler
    Active since:
    Active till:
    License:
    BSD
    Platforms:
    Embedded
  • Desktop
    MorphOS
    Author:
    The MorphOS Development Team
    Active since:
    Active till:
    License:
    Proprietary with GNU GPL
    Platforms:
    Amiga, PowerPC
  • Fiasco.OC Desktop
    Fiasco.OC
    Author:
    Technische Universität Dresden
    Active since:
    Active till:
    License:
    GNU GPL
    Platforms:
    IA-32, AMD64, ARM, PowerPC
  • Desktop
    Free DOS
    Author:
    Jim Hall
    Active since:
    Active till:
    License:
    GNU GPL
    Platforms:
    IA-32
  • Desktop
    ReactOS
    Author:
    ReactOS Contributors
    Active since:
    Active till:
    License:
    GNU GPL v2+ with parts under LGPL and BSD
    Platforms:
    IA-32, x86-64, ARM
  • Not available
    The Dresden Real-time Operating System Project (DROPS)
    Author:
    The DROPS team
    Active since:
    Active till:
    License:
    GNU GPL
    Platforms:
    IA-32, x86-64, ARM
  • Symbian Desktop
    Symbian
    Author:
    Symbian Ltd.
    Active since:
    Active till:
    License:
    Closed source; Open source
    Platforms:
    ARM, x86

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