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Welcome to page of niche operating systems. Here you can get acquainted with niche/hobby operating systems developed in last few decades. Majority of operating systems are sufficiently functional, few however are i.e. IA-32 real mode operating systems, some are even less developed and could be labeled as advanced boot loaders. More interesting operating systems in this page have memory management capabilities, multi-tasking capabilities and file system support. Closed source operating systems are omitted from this list.

  • Author:
    The AROS Development Team
    Active since:
    Active till:
    License:
    AROS Public License
    Platforms:
    IA-32, x86-64, PowerPC, m68k, ARM
  • Author:
    Computer Systems Research Group, University of California, Berkeley
    Active since:
    Active till:
    License:
    FreeBSD license
    Platforms:
    IA-32, x86-64, 64-bit SPARC, PowerPC, ARM, MIPS
  • Author:
    Eric Smith
    Active since:
    Active till:
    License:
    GNU GPL
    Platforms:
    Atari ST, Firebee, ARAnyM
  • Author:
    Computer Systems Research Group, University of California, Berkeley
    Active since:
    Active till:
    License:
    2-clause BSD license
    Platforms:
    Alpha, ARM, PA-RISC, 68k, MIPS, PowerPC, SH3, SPARC, RISC-V, VAX and x86
  • Author:
    Andrew Valencia
    Active since:
    Active till:
    License:
    GNU GPLv2
    Platforms:
    IA-32, Amiga
  • Author:
    Bell Labs
    Active since:
    Active till:
    License:
    GNU GPLv2; Lucent Public License
    Platforms:
    IA-32, x86-64, MIPS, DEC Alpha, SPARC, PowerPC, ARM
  • Author:
    Thomas Bushnell
    Active since:
    Active till:
    License:
    GNU GPLv2+
    Platforms:
    IA-32
  • Author:
    RISC OS Open
    Active since:
    Active till:
    License:
    Open source
    Platforms:
    ARMv7
  • Author:
    Niklaus Wirth, Jürg Gutknecht
    Active since:
    Active till:
    License:
    BSD
    Platforms:
    IA-32, x86-64, ARM