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.
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.
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!
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