ReactOS is a free and open-source operating system for x86/x64 personal computers intended to be binary-compatible with computer programs and devices. Developed by Aleksey Bragin
License: Open Source
ReactOS is an open-source alternative to Windows, designed to be compatible with Windows applications while being lightweight and customizable. In contrast, Windows XP is a well-established commercial operating system known for its extensive compatibility and user-friendly interface, though it is no longer officially supported.