pekwm - pekwm is a window manager that once up on a time was based on the aewm++ window manager, but it has...
bspwm - A tiling window manager based on binary space partitioning
Compiz - Project information. Maintainer: PS Project Management Team. Driver: Compiz Maintainers. Licence: GNU GPL v2, GNU LGPL v2. 1, MIT / X / Expat Licence.
dwm - dwm is a dynamic window manager for X. It manages windows in tiled, monocle and floating layouts. All of the layouts can be applied dynamically, optimising the environment for the application in use and the task performed.
qtile - Qtile is a full-featured, hackable tiling window manager written in Python.
spectrwm - spectrwm is a small dynamic tiling window manager for X11.