Web app: Roam
Roam keeps coming up in my feeds from friends. It looks not easily applicable for ZK because it does what wikis do, in that a link is a link and not a search. But it inherently contains the idea of connected text and is very oriented toward that. Notes are made by default divided by day, so there is an implicit temporal structure. The really nice looking part though is the built in graphing of the network.
It's a web app, and thus is not at all future proof. Based on this and the way links work, probably not something I will use for ZK, but definitely a tool worth checking out for anything involving linked concepts.
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