There's a great playlist on YouTube that shows the highlights of Doug Engelbart's amazing tech demo from 1968: https://m.youtube.com/playlist?list=PL76DBC8D6718B8FD3
It's an integrated dev environment, hypertext system, structured text, and even allows multiuser collaboration!
miniblog.
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Ted Nelson introducing some of the basic principles of Xanadu, his hypertext design: https://www.youtube.com/watch?v=hMKy52Intac
He stresses the importance of visible hyperlinks, an interesting choice when some UI designers argue that today's underlined links are distracting for readers.
Really cute video demo of the hypertext documentation in Symbolics Lisp Machines: https://youtu.be/7DxYj32cvoE
The speaker carefully explains why links are a good thing! It also lists history in a pane (rather than a back button) and has a stronger notion of navigating hierarchies.
Hyper-G is (was?) an interesting hypertext design, where hyperlinks were stored in a separate database to ensure integrity and allow visualisations with trivial backlink calculations: https://www.ickn.org/elements/hyper/cyb20.htm