colyn
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XFCE is a desktop environment on it's own, not a stripped down version. It uses parts of the GTK libraries. But, no Gnome applications are used. However, it supports both KDE and Gnome applications.
Gnome and XFCE are both GTK+2 based desktops. While it is a desktop in it's own rights it is a version of Gnome.
KDE however is QT based.