Miller columns

Horizontal columns. People seem to like it for browsing personal wikis.

FedWiki has this.

I added something along these lines to my own site (https://commonplace.doubleloop.net)

I'm not convinced it should be implemented within a site though. Feels kind of wrong pushing a navigation style on to the user.

It would be perhaps better at the browser-level e.g. Cartographist

But in fact as the author of that, says:

Additionally, it started to feel that I'm solving this problem on a wrong level. For example, a good window manager could replace Cartographist almost completely

– Cartographist ‒ Szymon Kaliski