KDE or the K Desktop Environment, is a network transparent contemporary desktop environment for UNIX workstations. KDE seeks to fulfill the need for an easy to use desktop for UNIX workstations, similar to desktop environments found on Macintosh and Microsoft Windows operating systems.
Together with a free implementation of UNIX such as GNU/Linux, UNIX/KDE constitutes a completely free and open computing platform available to anyone free of charge. Source code is available for anyone to look at, learn from, modify and improve. Whilst there is always room for improvement, KDE today delivers a viable feature packed alternative to the more commonly found commercial operating systems/desktops combinations available.
Download: KDE 4.4.4
Download: KDE 4.5 Beta