FVWM-Crystal
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FVWM-Crystal is a desktop environment based on the FVWM window manager. It uses GUI tools to edit the look of windows, instead of the use of editing a text file in FVWM. It features transparency flexible window decorations, among other features. It integrates very well with the XMMS, XMMS2, MPD, Quod Libet, and cdcd, to the point where it can control them. FVWM-Crystal makes good use of semi-transparency. Almost everything on the default desktop is semi-transparent. You have a choice of file managers, including ROX-Filer and Nautilus.