https://github.com/PaulWoitaschek/Voice
A web-based org-mode viewer
https://codeberg.org/gopiandcode/emacs-viewer
Emacs in the browser
https://github.com/karlicoss/cloudmacs
A giant page of some of the best hints and tips on how to use org-mode in Emacs and how to customize things.
http://doc.norang.ca/org-mode.html
A proprietary browser.
https://whale.naver.com/en
How Emacs' Gap Buffers implementation for text editing holds up against more modern datastructures.
https://coredumped.dev/2023/08/09/text-showdown-gap-buffers-vs-ropes