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Historical
Visual Knowledge Builders (VKB)
VIKI (Xerox Palo Alto Research Center)
SkyWiki (Universidad Politécnica de Valencia)
Microcosm (University of Southampton)
Webspiration (Inspiration Software Inc)
XandauSpace (Ted Nelson)
Current
These tools could be considered spatial (hypertext) knowledge graph style tools.
Networked knowledge tools (closer to Roam)
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Saga - capture memories (slightly different)
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