ReactOS | |
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Developer | Community contributors The ReactOS developers |
Written in | C, C++[3] |
OS family | Windows NT-like |
Working state | Alpha |
Source model | Open-source[4] |
Initial release | (partial) 1998 |
Latest preview | 0.4.15[5][1][2] / 21 March 2025[5] |
Repository | |
Marketing target | Personal computing |
Update method | CD-ROM ISO image, QEMU image, VirtualBox image, VMware image, or source code[6] |
Platforms | IA-32, x86-64 |
Kernel type | Hybrid (designed to be compatible with Windows NT family) |
Influenced by | Microsoft Windows |
Default user interface | Graphical (ReactOS Explorer) |
License | GPL-2.0-or-later[a] |
Official website | www |
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[update], 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.
0.4.15
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With software specifically leaving NT5 behind, ReactOS is expanding its target to support NT6+ (Vista, Windows 8, Windows 10) software.
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