Good write up , but you're wrong here :
Compiz was first Composite Manager for X Windows System developed by Novell.
xcompmgr and metacity were the first composite window managers.
Its debatable though , as to which is the first composite window manager.
Although Xfwm is the first 'stable' composite manager.
Also , you should mention that Beryl was indeed a fork of Compiz.
Compiz is the first '3D' composite window manager.