FVWM

Fvwm (F? Virtual Window Manager for X11) is a window manager for X11. It is designed to minimize memory consumption, provide a 3D look to window frames, and a virtual desktop. Fvwm is now in the portage tree and you can install it by using:

Use flags
= Enable GTK2 Perl bindings

= Enable screen locking

= Enable NetPBM support (used by FvwmScript-ScreenDump)

= Enable rplay support

= Mouse Gesture support

= FvwmPerl support

Configuration for fvwm
Fvwm Configuration file is ~/.fvwm/config.

http://en.gentoo-wiki.com/wiki/FVWM/Configuration