The canvas in Obsidian is as the whole app very well made. I wondered what they are using as well. My guess is https://www.xyflow.com/ https://www.xyflow.com/,

The canvas in Obsidian is as the whole app very well made. I wondered what they are using as well. My guess is https://www.xyflow.com/ https://www.xyflow.com/, which is for drawing nodes. More general purpose would be http://fabricjs.com/ http://fabricjs.com/. Or very low level https://pixijs.com/ https://pixijs.com/.