I'm looking for a very simple grapher that can plot a set of 3-dimensional points of the form {1,1,1},{2,1,1},{3,1,2} /whatever etc.

It doesn't have to be able to graph functions or anything so complicated - a simple online one that I didn't have to download would be perfect. I can't find any of those that handle 3-dimensional data though.

I'm on Linux, if the grapher has to be downloaded...