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For SMC (Sage Cloud), have a look at http://sagemath.blogspot.co.uk/2014/08/what-is-sagemathcloud-lets-clear-some.html

Sage Notebook (server), on the other hand, is something that is a part of Sage itself, and can be installed and used by anyone. There are few "open" sagenb servers around running, but they are mostly not really working any more, or not accepting new users.