What is a good Windows Manager for cygwin/XFree86

[David Arnstein]

The best window manager might be no window manager at all.  If you
start XWin.exe with the command line option -multiwindow, then you
won't need a window manager.  Instead, your X11 applications will all
appear in separate windows, managed by Microsoft Windows.

The cygwin guys have done a lot of work recently cleaning this feature
up.  It is now pretty good.