i3 - A dynamic tiling window manager designed for X11, inspired by wmii, and written in C.
pekwm - pekwm is a window manager that once up on a time was based on the aewm++ window manager, but it has...
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.
Compiz - Project information. Maintainer: PS Project Management Team. Driver: Compiz Maintainers. Licence: GNU GPL v2, GNU LGPL v2. 1, MIT / X / Expat Licence.
Openbox - Openbox is a highly configurable, next generation window manager with extensive standards support.
WindowFX - Revolutionize your operating system with WindowFX.