KDE (K Desktop Environment) is a desktop environment and development platform for Linux, Mac OS X, and Windows. See also GNOME. KDE is the first, free open source desktop environment which is still maintained today. KDE was founded in 1996 by Matthias Ettrich of Germany. The first public beta was released for Linux in 1997, and the first stable release "KDE 1.0" was released in 1998. Many applications are included with KDE, or are available from the KDE web site; including Konqueror, a file and web browser and application viewer; Rekonq, a stand-alone web browser for Linux which uses WebKit as its layout engine; and KMail, an email client.