ReactOS is an open source operating-system project aimed at development of a quality operating system based on Windows NT architecture, and that is compatible with Win32 applications and NT (XP, 2003) drivers.
Four months after the release of 0.3.4, we are pleased to announce ReactOS 0.3.5. This release, along with the rest of the 0.3.x series is still considered alpha quality software, so do not set your expectations too high.
ReactOS 0.3.5 release contains fixes for many old bugs, some having been present since 0.3 or even earlier and some being regressions introduced in further releases due to rewrites of certain components, not to mention new features.
Full changelog: http://www.reactos.org/wiki/index.php/ChangeLog-0.3.5
ReactOS website: http://www.reactos.org