I have not seen this mentioned here, but Dendron Notes https://www.dendron.so/ seems pretty interesting.

Like several other projects, this builds on VSCode. That means that it's cross platform. I added the extension to my ARM Chromebook this morning.

The project, at first glance, seems to be fairly popular with introductory videos and a bunch of documentation.

I've not tried to use it for anything yet, so I can't say how well it actually works, but it looks pretty interesting.