In Pictures: 10 amazing Linux desktop environments...
Sugar is a Desktop Environment focused on kids and education. Applications are run one at a time in full screen. There are no windows to manage. There is no desktop. Heck, there's really not even any concept of “files” for the user to deal with. Instead, Sugar provides a “Journal” that provides snapshots of saved application states.
In Pictures: 10 amazing Linux desktop environments you've probably never seen