Highly extensible, closed-source Networked note-writing software based on Electron.
Markdown is central to its conceptual model: all data is stored in Markdown plaintext; the editor puts Markdown front and center.
A recent “live editor” offers a hybrid experience: it mostly hides the Markdown syntax, but the syntax is “still there.” When your cursor is positioned in/near some relevant syntax, that syntax is displayed. And so “arrowing” around the document sometimes involves moving targets.
I like their philosophy and their commitment to open formats.
Obsidian Publish, one of their two paid products, is basically a commercial adaptation of my personal notes web site design. (There’s some acknowledgement of that here, though narrowly scoped to the tab stacks. That’s fine).