What are you looking for? I used to use Notational Velocity in an encrypted volume hosted on Dropbox, but I ended up switching to Obsidian for the mobile support.
I’m not actually looking, Syncthing solves 90% and I’m hard pressed to believe anyone needs live document collaboration outside of an office context that screensharing doesn’t already solve. Most of the time when everyone “collaborates”, only 1-2 people of the group are doing the typing.
Unfortunately, most users don't know how to setup the tools you are talking about. Additionally they end up having to share some document at some point or another. They end up with browser based tools and a shared server. Google most of the time for individuals. Most users want their data in one place for all use cases.
Network effects make it so that only tools that allow you to invite anybody to your document (guests without accounts included) end up gaining traction. Desktop apps might be able to achieve this using some web proxy so who knows, it might change in the future.
Our goal at CryptPas is to make it familiar for them to move from Google while having e2ee here to protect their privacy, which also gives them a reason to switch
The more people can get out, to any open alternative, the more alternatives can then decide to fight each other.
In the mean time, we should not try too much to get the rest of the world on our own workflow, just let all the different approaches strive.
BTW maybe CryptPad's API ( https://github.com/cryptpad/cryptpad-api-examples ) could help you solve the case where you do need to edit a document collaboratively from your computer. Would you be interested in a tool allowing to create a session for editing with CryptPad allowing to sync back changes or save the end result back to your computer ?
