A while back, when I looked at Slax, I found an oddball little window manager listed among the options in the Fluxbox right click menu: mwm. I’d never heard of mwm, but after searching for it, I found a completely different one — cwm.
The man pages are rather sparse, but those and the home page suggest it has ties to both evilwm and plan9, in a roundabout way. As you can see I hadn’t much of a chance to use it to its fullest potential, but I can see where this might also be attractive for an X-based console system. The screenshot on the home page is more convincing.
For my own part I am still a fan of Musca, if I have to push a machine to use Xorg at all. But if you’re looking for a new window manager that’s out of the ordinary, cwm might be an idea.
P.S.: And for what it’s worth, mwm is the old Motif window manager. Probably.