Cinnamon is a fork of the Gnome 3 desktop environment, created by the Linux Mint developers. The latest version available is Cinnamon 2.0, which brings improvements and new features to the previous version, Cinnamon 1.8. For a full list of changes and new things, see the official announcement.

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How To Install Cinnamon 2.0 On Ubuntu 13.10, 13.04, 12.10, 12.04, Linux Mint 15, 14, 13 (LinuxG.net)