http://www.reactos.org/

ReactOS <http://www.reactos.org/en/about.html>(r) is an advanced free open
source <http://en.wikipedia.org/wiki/FOSS> operating system providing
a ground-up
implementation of a Microsoft Windows(r) XP compatible operating
system<http://en.wikipedia.org/wiki/Operating_system>.
ReactOS aims to achieve complete binary
compatibility<http://www.reactos.org/support/>with both
applications <http://www.reactos.org/support/index.php/comp/cat/id/2/>
and device
drivers <http://www.reactos.org/support/index.php/comp/cat/id/1/> meant for
NT and XP operating systems, by using a similar architecture and providing a
complete and equivalent public interface.
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