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An operating system based on the best Windows NT design principles
ReactOS is an open source effort to develop a quality operating system that is compatible with applications and drivers written for the Microsoft Windows NT family of operating systems (NT4, 2000, XP, 2003).
This FreeDOS distribution's primary focus is to provide a single source for updating or obtaining the latest FreeDOS BASE set, with emphasis on compatibility with ReactOS/WinNT (Win32 ports) and modern 386+ computers. FreeDOS is a trademark of Jim Hall
StepOS is an open-source operating system that is designed solely to run StepMania, the popular 'dance simulation game', on arcade dedicated cabinets, and is easy to install and maintain. StepOS is based off of the open-source operating system ReactOS.
ReactOS Synthesis Project (RSP) is aimed at combining a Microsoft Windows installation with ReactOS system files, so as to replace and complement/extend functionality. The advantages range from fixing issues to implementing desired functionality.
AppSignal's MCP server hands Claude, Cursor, or Zed your real errors, traces, and the deploy that shipped them. AI writes the fix; you review the diff.