Project Xanadu
ザナドゥ計画
Enfilade
(Xanadu)
Hypermedia
ENQUIRE
Interpedia
American Information Exchange
Tent
(protocol)
In addition to the Web, the Project Xanadu FAQ suggests other hypermedia systems which are similar, including HyperWave (or Hyper-G) and:
Microcosm
(hypermedia system)
IBM Notes
(descendant of Notes on PLATO (computer system), featured in Nelson's Computer Lib)
Wiki
Memex
ipfs
https://en.wikipedia.org/wiki/Project_Xanadu