It's like a specialised case of org-babel for the masses.
Anyone with emacs can do this today, for free. The huge caveat is that it requires
emacs.
Where this tool shines, is that it's a superset of markdown, and thus not tied to any particular editor.
I haven't played with any of the alternative/independent implementations of Org mode but there are several out there¹. It would be cool to use one as the basis for a tool like Runme, or a collection of plugins for other editors.
Anyone with emacs can do this today, for free. The huge caveat is that it requires emacs. Where this tool shines, is that it's a superset of markdown, and thus not tied to any particular editor.