ReactOS Project

http://www.reactos.org/en/foundation_donate.html

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ReactOS Project is a community-driven, open-source operating system project whose aim is to recreate a Windows-compatible platform. It is governed and supported by the ReactOS Foundation, a nonprofit organization that coordinates governance, fundraising, and oversight for the project. Developers and contributors are volunteer researchers and engineers from around the world, collaborating to build a free alternative that can run Windows software and drivers.