Worth mentioning here that LogSeq can work with markdown or org-mode files. In my personal setup one of my LogSeq nodes points to my BrainTool.org file which holds all my bookmarks, web-resource pointers and associated notes. This way I can bounce between working in Chrome, emacs and LogSeq all referencing the same underlying data model. (With Orgzly for a read-only view on my phone.)

See also org-roam (https://www.orgroam.com/) - an emacs-native bidirectional linking PKM solution.

Love the org support in LogSeq! Probably the deciding factor why I chose it over Dendron(which is great as well).

LogSeq also has experimental Android support: https://github.com/logseq/logseq/releases/tag/0.5.8

Thank you so much for pointing out upcoming Android support! That's a huge factor for me.

Which of those downloads is an Android app? I didn't see an APK, which is usually how they come.

Edit: Nevermind. I see they link to the nightly release where a working version can be obtained[0]. Running it now.

[0] https://github.com/logseq/logseq/releases/tag/nightly

With org-roam you can create neat note graphs as well: https://imgur.com/a/9oyHMCt

Out of curiosity, what is your favorite UI to type in?

"org-roam" is the package written specifically to emulate Zettelkasten. It's amazing package.