Disclamer: Linkurious CEO here, the tool used to explore the Neo4j graph database used at NASA.
There is also an extension to it called TiddlyMap which displays several of the properties mentioned in this article (edges with properties, etc), but again, requires configuration to get just so.
If you're game to do some tinkering, I've found it to be hackable to some very deep levels. Another nicety is that it's all just a single HTML file, so it's madly portable (I can use the same site on my phone and laptop).
All this being said, there is a growing list of features that I would like to see in Tiddlywiki that I'm not sure I can hack in myself, so I suppose I, too, am looking for the "one true knowledge management" solution
Jerry Michalsky is among the more notable users.
Otherwise see Marviel and DredMorbius's suggestions both are worth checking out.
address at domain dot com :)
PS: Sent you an email. :)
https://jena.apache.org/ https://jena.apache.org/documentation/fuseki2/
Once you need "big data" for your personal Knowledge Graph, you can use other RDF stores, without vendor lock-in.
[1] https://sma.nasa.gov/sma-disciplines/planetary-protection