I used the revelatory Notational Velocity many years ago. When it disappeared, I searched high and low, using many competing apps and services that tried to offer something beyond (ahem) TextEdit and the OS. Years later, here it is.
Obsidian is superb: the right amount of privacy that doesn't expect you to upload everything into the cloud and the right amount of base features that does everything some cloud services do — and then some, with the relative reliability and speed — and all this before we get to the plug-ins and add-on services if you need complex collaboration or a publishing platform.
