Cinnamon is another attempt to make the GNOME 3 desktop acceptable to those in the community who have so far refused to have an unpalatable substance rammed down their throats. While MATE is a fork of GNOME 2,

Cinnamon is a fork of GNOME 3 Shell. And though better than the other attempts, it does not really represent a sharp break from GNOME 3 + MGSE. Imagine GNOME 3 + MGSE without the Applications view or menu, and you have Cinnamon.