pekwm - pekwm is a window manager that once up on a time was based on the aewm++ window manager, but it has...
i3 - A dynamic tiling window manager designed for X11, inspired by wmii, and written in C.
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.
Xmonad - xmonad is a dynamically tiling X11 window manager that is written and configured in Haskell.