FAQ

ReactOS, or ROS for short, is an operating system. Their own main features are:

• ReactOS is able to run Windows software

• ReactOS is able to run Windows drivers

• ReactOS looks-like Windows

• ReactOS is free and open source

In Nerd-ese: 

ReactOS is a free and open-source operating system for amd64/i686 personal computers intended to be binary-compatible with computer programs and device drivers made for Windows Server 2003 and later versions of Windows.[5][6] ReactOS has been noted as a potential open-source drop-in replacement for Windows[7][8][9] and for its information on undocumented Windows APIs.[10]

ReactOS has been in development since 1996. As of January 2022, it is still considered feature-incomplete alpha software, and is therefore recommended by the developers only for evaluation and testing purposes.[11][12] However, many Windows applications are currently working, such as Adobe Reader 6.0 and LibreOffice.[13][14]

ReactOS is primarily written in C, with some elements, such as ReactOS File Explorer, written in C++. The project partially implements Windows API functionality and has been ported to the AMD64 processor architecture.[15] ReactOS, as part of the FOSS ecosystem, re-uses and collaborates with many other FOSS projects,[16][17] most notably the Wine project, which presents a Windows compatibility layer for Unix-like operating systems.

General Disclaimer: ReactOS is Alpha-Quality Software, and we are not responsible for damages to a REAL PRIMARY computer. Use a VM if you wanna test it