This whole area is very underserved in how people
interact with their computers, glad to see people
pushing at it.
Are there any tools other than org-mode that you have your eye on?
outliner
org-tangle/org-babel, literate programming and/or http://www.howardism.org/Technical/Emacs/literate-devops.htm...
broadly exportable format
calendar/todo/personal information management
etc etc
I'm not aware of anything else that covers that territory.
However Xiki and IPython (Jupyter now) do have some of the aspects of the "computational document" that I think of in this broader context.