It’s amazing for how long Emacs’ Org-mode has been largely unparalleled! Apart from the revered desktop setup, there are now a bunch of mobile offerings including Organice — not quite slick, but definitely useful.
I‘m sincerely rooting for more experiments in this area. I would love to be able to write by hand or speak to my memex (multi-modal interaction). Vannevar Bush’s “As we may think” has languished uncourted for pitifully long. In some ways, this was supposed to be the first “killer app” for personal computing.