Compiz - Project information. Maintainer: PS Project Management Team. Driver: Compiz Maintainers. Licence: GNU GPL v2, GNU LGPL v2. 1, MIT / X / Expat Licence.
Wayland - Wayland is intended as a simpler replacement for X, easier to develop and maintain.
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.
Mir - The purpose of Mir is to enable the development of user interfaces shells.
Witch - Welcome to the world of W. i. t. c. h.
XQuartz - The XQuartz project is an open-source effort to develop a version of the X.