ReactOS

ReactOS
ReactOS 0.4.14 desktop[1][2]
DeveloperCommunity contributors
The ReactOS developers
Written inC, C++[3]
OS familyWindows NT-like
Working stateAlpha
Source modelOpen-source[4]
Initial release(partial) 1998 (1998)
Latest preview0.4.15[5][1][2] / 21 March 2025 (2025-03-21)[5]
Repository
Marketing targetPersonal computing
Update methodCD-ROM ISO image, QEMU image, VirtualBox image, VMware image, or source code[6]
PlatformsIA-32, x86-64
Kernel typeHybrid (designed to be compatible with Windows NT family)
Influenced byMicrosoft Windows
Default
user interface
Graphical (ReactOS Explorer)
LicenseGPL-2.0-or-later[a]
Official websitewww.reactos.org
ReactOS 0.4.14 running the Firefox web browser

ReactOS is a free and open-source operating system for i586/amd64 personal computers that is intended to be binary-compatible with computer programs and device drivers developed for Windows Server 2003 and later versions of Microsoft Windows.[7][8] ReactOS has been noted as a potential open-source drop-in replacement for Windows[9][10][11] and has been of interest for its information on undocumented Windows APIs.[12]

ReactOS has been in development since 1996. As of April 2025, it is still considered to be feature-incomplete alpha software. Therefore, it is recommended by the developers to be used only for evaluation and testing purposes.[13][14] However, many Windows applications are working, such as Adobe Reader 9.3, GIMP 2.6, and LibreOffice 5.4.[15][16]

ReactOS is primarily written in C, with some elements written in C++, such as the ReactOS File Explorer. The project partially implements Windows API functionality and has been ported to the AMD64 processor architecture.[17] ReactOS is part of the FOSS ecosystem so it re-uses and collaborates with many other FOSS projects,[18][19] most notably the Wine project that presents a Windows compatibility layer for Unix-like operating systems.

  1. ^ a b reactos on GitHub
  2. ^ a b ReactOS at DistroWatch
  3. ^ "ReactOS on Open Hub". openhub.net. Black Duck Open Hub. Retrieved 24 October 2014.
  4. ^ "ReactOS on GitHub". GitHub. Retrieved 27 April 2019.
  5. ^ a b Cite error: The named reference 0.4.15 was invoked but never defined (see the help page).
  6. ^ "Download | ReactOS Project". www.reactos.org. Retrieved 28 July 2017.
  7. ^ Holwerda, Thom (5 March 2009). "ReactOS Targets Windows 2003, Vista". OSNews. Retrieved 14 October 2020.
  8. ^ vicmarcal (14 April 2018). "ReactOS 0.4.8 released!!". ReactOS.org Project News (Corporate blog). Archived from the original on 16 April 2018. Retrieved 14 October 2020. With software specifically leaving NT5 behind, ReactOS is expanding its target to support NT6+ (Vista, Windows 8, Windows 10) software.
  9. ^ Stahl, Louis-F. (23 June 2015). "Russland erklärt ReactOS zu favorisierter Windows-Alternative". heise online. Retrieved 14 October 2020.
  10. ^ Cite error: The named reference Spiegel was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference dvorak was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference undocumented was invoked but never defined (see the help page).
  13. ^ Kupfer, Matthias; Bragin, Aleksey (14 March 2010). ReactOS — Das zu Windows binärkompatible Open-Source-Betriebssystem. Chemnitzer Linux-Tage (in German). Chemnitz, Germany. Retrieved 15 March 2010.
  14. ^ Cite error: The named reference lowendmacreview was invoked but never defined (see the help page).
  15. ^ Thom Holwerda (14 November 2007). "ReactOS Gets OpenOffice.org 2 Support; New Release Plans". OSNews.
  16. ^ Tests for 0.4.14 on reactos.org (February 2022)
  17. ^ Cite error: The named reference 2008review was invoked but never defined (see the help page).
  18. ^ Cite error: The named reference collaboration was invoked but never defined (see the help page).
  19. ^ Cite error: The named reference collaboration2 was invoked but never defined (see the help page).


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