ReactOS is a free, open source, Windows compatible operating system.

Imagine running your favorite Windows applications and drivers in an open-source environment you can trust. That's ReactOS. A free, open source, Windows compatible operating system.

It's written from scratch, not based on Linux, with 9,000,000+ lines of code and growing. More than 100 developers contributed along the years

It aims to be lightweight with only 500MB HDD and 96MB RAM as the current minimum requirement.

Developers enjoy a fast, CMake based build system that supports GCC, Clang and MSVC toolchains (including Visual Studio solutions support).

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ReactOS 2016 Projects

  • amaneureka
    ATA/ATAPI drivers AHCI Support
    This project is a part of Google Summer of Code 2016 under the organization ReactOS. I proposed an idea of implementing storahci for windows 2003 and...
  • Vardan Mikayelyan
    Improve ReactOS USB stack.
    The aim of this project was to have more stable USB stack in ReactOS operating system and improve it to support Plug and Play. Implementation,...
  • coderTrevor
    NTFS Driver Improvements for ReactOS
    ReactOS is an open source operating system that aims to be compatible with Windows. It specifically targets Windows Server 2003, but it still relies...
  • zhu48
    Win32 Network Driver with lwIP 1.4.1
    Currently, ReactOS lacks a working, unified network stack. I will implement a unified UDP and TCP driver using lwIP 1.4.1.