Notion, Roam, Evernote, OneNote, Bear, Obsidian. They are all centred around writing text documents that flow from left-to-right, then top-to-bottom; the way all text works in English. Even if they support other languages, you'd still write Arabic or Hebrew or Urdu linearly, just right-to-left.
You might say this is what defines a note; it is a chunk of written text, presented as a small piece of digital paper. It's pretending to be a real piece of paper, but without many of the features that make real paper useful. Like the ability make marks on it that are not simply words in a straight line.
Found on Ben Tsai’s Twitter, who posts about a lot of interesting non-linear note ideas. Some worth exploring: