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This has to be the best note taking system. @Fintan Halpenny (on Slack) introduced it. Here's an excellent summary of it: https://writingcooperative.com/zettelkasten-how-one-german-scholar-was-so-freakishly-productive-997e4e0ca125
I myself started implementing it yesterday.
All plain-text based, because Zettelkasten is for life, so any format must be future proof.
I do use the Rib static generator (#Rib) to generated HTML view of the various notes. Recently I implemented a mmark-ext extension to support wiki style linking of zettel notes.
New web app in beta: https://roamresearch.com/
I just had an idea. Why not make my whole personal website ... a public zettelkasten? There would be no distinguishing between 'notes' and 'tidbit' and any other content type. All are notes, but their 'structure' is evolved organically (based on the connections formed over time) .. leading to some notes being tagged as say "portal" which then can be used in the front page, as portal into the website. It can even act as a wiki, without advertising itself as one.
This topic is now moved to #General https://funprog.srid.ca/general/zettelkasten.html