Operating System
Visopsys
Andy McLaughlin · 2001
- Family
- Other
- Type
- Desktop
- Kernel
- Monolithic
- Version
- 0.92 / 21 September 2023; 2 years ago (2023-09-21)
- License
- GPL, LGPL
- Released
- 2001
Operating System
Windows XP
Microsoft · 2001
- Family
- Windows
- Type
- Desktop
- Kernel
- Hybrid, NT
- Version
- 5.1
- License
- Proprietary, commercial software
- Released
- 2001
Operating System
Darwin (operating system)
Apple · 2000
- Family
- Unix-like
- Type
- Desktop
- Kernel
- Hybrid, XNU
- Version
- 0.6.1
- License
- Apple Public Source License, MIT License, BSD License
- Released
- 2000
Operating System
Finnix
Ryan Finnie · 2000
- Family
- Linux (Unix-like)
- Type
- Desktop
- Kernel
- Monolithic (Linux)
- Version
- 251[1] / 17 November 2025; 6 months ago (17 November 2025)
- License
- Various
- Released
- 2000
Operating System
Fli4l
fli4l-Team[1] · 2000
- Family
- Linux (Unix-like)
- Type
- Desktop
- Kernel
- modular
- Version
- 3.10.19[2] / 2 February 2020 (6 years ago) (2020-02-02)
- License
- GPL (Free software)
- Released
- 2000
Operating System
Knoppix
Klaus Knopper · 2000
- Family
- Linux, Unix-like
- Type
- Desktop
- Kernel
- Monolithic, Linux
- Version
- 9.3 / 5 May 2022; 4 years ago (5 May 2022)
- License
- Free software, GPL
- Released
- 2000
Operating System
Red Hat Enterprise Linux
Red Hat, Inc. · 2000
- Family
- Linux, Unix-like
- Type
- Desktop
- Kernel
- Monolithic, Linux
- Version
- 10:10.2 / May 20, 2026; 12 days ago (2026-05-20)9:9.8 / May 20, 2026; 12 days ago (2026-05-20)8:8.10 / May 22, 2024; 2 years ago (2024-05-22)7:7.9 / September 29, 2020; 5 years ago (2020-09-29)
- License
- free software, binary blobs
- Released
- 2000
Operating System
Mac OS 9
Apple Computer · 1999
- Family
- Macintosh
- Type
- Desktop
- Kernel
- Microkernel
- Version
- 9.2.2 / December 5, 2001; 24 years ago (2001-12-05)
- License
- Proprietary
- Released
- 1999
Operating System
Mac OS X Server
Apple · 1999
- Family
- Macintosh, Unix
- Type
- Server
- Kernel
- Hybrid, XNU, monolithic
- License
- Commercial, proprietary software
- Released
- 1999
Operating System
NetBoot
Apple · 1999
- Family
- Other
- Type
- Desktop
- License
- proprietary
- Released
- 1999
Operating System
Windows 98 Second Edition
Microsoft · 1999
- Family
- Windows
- Type
- Desktop
- Kernel
- Hybrid
- Version
- 4.10.2222
- License
- Proprietary
- Released
- 1999
Operating System
Fermi Linux
Fermilab · 1998
- Family
- Linux (Unix-like)
- Type
- Desktop
- Kernel
- Monolithic (Linux)
- Version
- 6.7 / October 18, 2015; 10 years ago (2015-10-18)
- License
- Mainly GPL
- Released
- 1998
Operating System
ThreadX
Express Logic (original)Microsoft (former)Eclipse (current) · 1997
- Family
- Other
- Type
- Desktop
- Kernel
- Embedded, deterministic, real-time microkernel, picokernel
- Version
- 6.4.1[1] / February 28, 2024; 2 years ago (2024-02-28)
- License
- MIT License (as of 2023)
- Released
- 1997
Operating System
MkLinux
OSF, Apple Computer, volunteer community · 1996
- Family
- Macintosh, Linux, Unix-like
- Type
- Desktop
- Kernel
- Microkernel
- License
- GNU General Public License
- Released
- 1996
Operating System
Netwide Assembler
Unknown · 1996
- Family
- Other
- Type
- Desktop
- License
- BSD 2-clause
- Released
- 1996
Operating System
Windows CE
Microsoft · 1996
- Family
- Windows
- Type
- Desktop
- Kernel
- Monolithic
- License
- Commercial, proprietary software
- Released
- 1996
Operating System
Windows NT 4.0
Microsoft · 1996
- Family
- Windows
- Type
- Desktop
- Kernel
- Hybrid
- Version
- 4.0
- License
- Commercial, proprietary software
- Released
- 1996
Operating System
Windows 95
Microsoft · 1995
- Family
- Windows
- Type
- Desktop
- Kernel
- Monolithic
- Version
- OEM Service Release 2.5 (4.0.950 C) / November 26, 1997; 28 years ago (1997-11-26)
- License
- Proprietary, commercial software
- Released
- 1995
Operating System
MS-DOS 6.22
Microsoft · 1994
- Family
- DOS
- Type
- Desktop
- Kernel
- DOS
- Version
- 6.22
- License
- Proprietary
- Released
- 1994
Operating System
OpenSUSE
openSUSE Project · 1994
- Family
- Unix-like, Linux
- Type
- Desktop
- Kernel
- Monolithic, Linux
- Version
- openSUSE Leap: 16.0 / 1 October 2025; 8 months ago (1 October 2025)
- License
- Free software, GNU GPL
- Released
- 1994
Operating System
Debian
Debian Project · 1993
- Family
- Linux
- Type
- Desktop
- Kernel
- Monolithic, Linux
- Version
- 13.5 "Trixie" / 16 May 2026; 16 days ago (2026-05-16)
- License
- Free licenses, DFSG
- Released
- 1993
Operating System
Jurix
Florian La Roche · 1993
- Family
- Linux, Unix-like
- Type
- Desktop
- License
- GNU GPL
- Released
- 1993
Operating System
Slackware
Patrick Volkerding · 1993
- Family
- Linux, Unix-like, Softlanding Linux System
- Type
- Desktop
- Kernel
- Monolithic, Linux
- Version
- 15.0 / 2 February 2022; 4 years ago (2 February 2022)
- License
- GNU General Public License
- Released
- 1993
Operating System
AmigaOS 3.2
Hyperion · 1992
- Family
- AmigaOS
- Type
- Desktop
- Kernel
- Exec
- Version
- 3.2
- License
- Proprietary
- Released
- 1992
Operating System
Plan 9
Bell Labs · 1992
- Family
- Research
- Type
- Desktop
- Kernel
- Plan 9
- Version
- Fourth Edition
- License
- Open source
- Released
- 1992
Operating System
Project Builder
Unknown · 1992
- Family
- Other
- Type
- Desktop
- License
- Freeware, open-source
- Released
- 1992
Operating System
Linux
Linus Torvalds, BDFL · 1991
- Family
- Unix-like
- Type
- Desktop
- Kernel
- Monolithic
- License
- GPLv2, kernel, [g]
- Released
- 1991
Operating System
Linux kernel
Unknown · 1991
- Family
- Linux
- Type
- Desktop
- License
- GPL-2.0-only with Linux-syscall-note[10][11][12][c]
- Released
- 1991
Operating System
SunOS 4
Sun Microsystems · 1991
- Family
- Unix
- Type
- Server
- Kernel
- SunOS
- Version
- 4.1.4
- License
- Proprietary
- Released
- 1991
Operating System
System 7
Apple Computer · 1991
- Family
- Macintosh
- Type
- Desktop
- Kernel
- Monolithic, nanokernel
- Version
- 7.6.1 / April 7, 1997; 29 years ago (1997-04-07)
- License
- Proprietary
- Released
- 1991
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