From ericax’s comment on orange site:

  1. Local-first, Markdown plain text based; 2. Link as first-citizen. 3. As extensible as possible.

Obsidian is a powerful front-end for your knowledge, like an IDE for your notes.

Personal Knowledgebases
!pkb

    From the commonplace book to the zettelkasten to the personal wiki, and everything in between. Technology-focused content and practice-based content both welcome. While we’re still small, screenshots of your notes that you’re particularly proud of are also welcome!