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KLook gets PDF/ODT support, while StackFolder gets drag-n-drop

KLook is a multi-file-type viewer. It is not an application that can be started standalone, but is integrated into other applications, like Dolphin, KDE’s file manager. StackFolder, on the other hand, is a widget application that makes it possible to browse the contents of a directory, or your entire home folder, without opening Dolphin. It is similar, to the Directory Menu of the Lightweight X11 Desktop Environment (LXDE).