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 aims to provide an open-source alternative to Windows, focusing on compatibility with Windows applications, while Ubuntu GNOME offers a polished and user-friendly experience with a vast software repository. The main difference lies in ReactOS’s goal of Windows compatibility versus Ubuntu GNOME’s focus on usability and broad hardware support.