The KDE desktop environment is a free open source project based on the Qt cross-platform application and UI framework, this helps to provide a consistent look and feel throughout its applications. KDE has plenty of applications, themes and wallpapers available via KDE-Apps and KDE-Look which are full of community submissions. KDE also uses the Plasma Desktop which provides widgets for all sorts of notifications and informational windows, widgets can be placed on the desktop or in the panel and can notify you of new emails, or keep you up to date with RSS feeds and much more. If you like desktop effects like wobbly windows or the desktop cube then KDEs built in window manager KWin provides all that, as well as smart window placement, tiling and window grouping. You can also achieve the same with compiz-fusion which also runs with KDE.
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