KDE 4 goes Cross-platform : Windows, Mac OS X

Can’t live without open-source KDE (K Desktop Environment). Here you go. The KDE desktop environment is making the jump across platforms with broad support for Windows and Mac OS X. The core KDE desktop programs, the KOffice suite, and the Amarok music player are actively being ported.
Download Link: KDE Beta for Windows
http://webdev.cegit.de/snapshots/kde-windows/installer/unstable/

Full Article: KDE goes cross-platform with Windows, Mac OS X support