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
KDE neon is a Linux distribution that focuses on providing the latest KDE software on a stable Ubuntu base, making it ideal for users who want a modern desktop experience. In contrast, ReactOS is an open-source operating system that aims to recreate a Windows-like environment, making it suitable for users needing compatibility with legacy Windows applications.