That's +3 for Obsidian, which has a Nostr plug-in and a phone app available on nostr:npub10r8xl2njyepcw2zwv3a6dyufj4e4ajx86hz6v4ehu4gnpupxxp7stjt2p8.
Any others?
Discussion
nope. except for maybe Markor + Syncthing, but different use case. i use Obsidian as well as markor