Org-mode is awesome. But only in the context of Emacs. Markdown is less capable, but almost ubiquitous. I went from org-mode[^0] to markdown some years ago, and the only thing I am missing is org-tables.

Currently I am using a set of markdown editors: Ulysses[^1], Typora, iA Writer and a few others. That makes me interface agnostic. The most important thing is the content, the (markdown)text I am producing. I can't say that about text in org-mode. It's tied to Emacs.

(Edit:)

In Ulysses I started using an annotation system myself, that's why this project here caught my attention. I am experimenting with brackets, double brackets, colons, double colons. Still in the process of experimenting.

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[^0]: was using org-mode to write documentation, journal entries, and as a task management system

[^1]: Ulysses is way more than an editor. It is like Evernote with markdown targeting authors. It‘s my ‚Zettelkasten‘

Org mode looks great, thanks for calling my attention to it. For anyone looking for a brief introduction, they have a compact guide[1] on their site that took me a minute to find.

It looks great for coders who are ready to learn new syntax. Though what I'd really like to avoid with Margin is anything that makes the language more complex than it needs to be.

For example, org mode defines headlines as:

    The headlines in Org start with one or more stars, on the left margin. For example:
    * Top level headline
    ** Second level
    *** Third level

With Margin, there's no concept of a "headline." For the thinker, the headline could be represented by any level of the plain text hierarchical tree. And the thinker would then be free to choose (or conform to) any Margin-based app that corresponds with their model. In other words, it works best however you want to use it.

[1] https://orgmode.org/guide/