I made one called MicroPad a few years ago (https://getmicropad.com) and just launched v4 a few weeks ago.
It's pretty full of features and each note is an infinite whiteboard/canvas where you can embed elements anywhere (for example I go horizontally for tangents)
It's pretty full of features and each note is an infinite whiteboard/canvas where you can embed elements anywhere (for example I go horizontally for tangents)