I've long been interested in the domain of "personal knowledge engineering" and this clearly seems a common thread within our community. As a brief overview of the "SOTA:"
* Emacs and Vim users skew towards Org-mode or Vim wiki.
* Roam Research is sort of a recent web-based alternative.
* There's a lot of competition in the domain of fully-fledged note taking apps. Evernote has long been viewed as a king of note-taking but lost its edge over time (bad editor, bugs, lack of attention to their users). Memex seems to be gaining popularity even though their software looks somewhat buggy at the moment.
* Otherwise, people naturally develop their own (similar) systems. I myself have independently developed a custom-made Vim wiki before starting research into this topic. It basically consists of a few grepping/Vim aliases to search/create Markdown in a `~/.notes` folder, backed up to GitHub. `mod+-` is bound to an i3 sratchpad where Vim is constantly open to `~/.notes/index.md`. This drastically reduces friction when making new notes.
In any case, seems interesting that a lot of the personal note-taking systems have separately adopted similar principles to what Zettelkasten proposes:
1. Heavy reliance on tagging
2. Some sort of deep linking
3. Preference to making small, independent "knowledge chunks"