What is ReactOS?

ReactOS is a free, open-source operating system that is capable of running Windows programs. It began in 1996 as a project to create a free version of Windows 95. In 2004, the first functional version was released, featuring compatibility for programs compiled for Windows Server 2003.

As of 2020, ReactOS is still in the alpha stage of development, to be used for testing purposes only.

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

official reactos.org