I am not and never have been an emacs user, yet I still know of org-mode.
I've heard of it many times, but have basically no conception of what it actually is.
It's a file format / markup language (think Markdown but more feature-rich) with excellent editor support in Emacs.
That's like describing a swiss army knife as a "beer opener"
It was inspired partly by org-mode, but org-mode can be quite difficult for non LISP-users. This project has the priority of low barrier to entry, with a lot of the Python-specific functionality coming out-of-the-box, and abstracted away underneath the syntax of "frames and calls." Even those are can be used only as desired; as another poster mentioned, the project has wiki-like functionality without going any deeper than the basic syntax.
Is it 'org-mode'?
Similar, thanks for asking. Org-mode was one of many inspirations.