I guess if we all add our favourite papers, we’ll end up with a very long list indeed. My own additions: As we may think by Vannevar Bush, and then something on

I guess if we all add our favourite papers, we’ll end up with a very long list indeed. My own additions: As we may think by Vannevar Bush, and then something on Project Xanadu. There doesn’t seem to be any foundational paper on the latter, but there is Ted Nelson’s book Literary Machines.