CrunchBang Linux Wiki
The default window manager (WM) in Crunchbang is Openbox, but it is comparably easy to add other window managers. The Crunchbang Forums offer many threads that introduce and deal with different WM.
#! Forums WM/DE Talk Recommended Read: 30 Window Managers reviewed
Awesome WM dwm Fluxbox fvwm herbstluftwm i3 icewm musca pekwm Spectrwm (formerly Scrotwm) ratpoison