CLFSWM is a window manager for X11 written in Common Lisp and inspired by stumpwm and tinywm. Windows and frames are often fullscreen maximized (no decorations). A frame can contains windows or other frames (tree of frames). It's not really a tiling window manager.
A more explicit presentation video can be found here http://www.youtube.com/watch?v=Jv0UQR-5ZLs (and a slower one on common-lisp.net).