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but where are others publsihed?

Publishing of files in SageMathCloud was only introduced less than a week ago, and there is no index to other people's published documents yet. I figured it was better to release the functionality, then implement the index later, rather than not releasing anything at all.

the cloud projects use like labyrinth, it is too complex.......

I'm sorry that it is too complex/powerful. It should get simpler and more usable as we further polish it.