Sawfish rocks, but is implemented in c and scripted through lisp (in a dialect called "Rep"). Guile-wm is lisp all the way down, is implemented with Guile-xcb,

Sawfish rocks, but is implemented in c and scripted through lisp (in a dialect called "Rep"). Guile-wm is lisp all the way down, is implemented with Guile-xcb, a X client written completely in Guile.