Compiz - Project information. Maintainer: PS Project Management Team. Driver: Compiz Maintainers. Licence: GNU GPL v2, GNU LGPL v2. 1, MIT / X / Expat Licence.
i3 - A dynamic tiling window manager designed for X11, inspired by wmii, and written in C.
Witch - Welcome to the world of W. i. t. c. h.
Fluxbox - Fluxbox is a window manager for X that was based on the Blackbox 0.61.1 code.
Dexpot - If you don't have Dexpot yet, the new update makes it a must-have tool for Windows, adding a ton of features to your desktop that you never knew you wanted.
Openbox - Openbox is a highly configurable, next generation window manager with extensive standards support.