Whiteboarding tools I’ve used interviews and teams
https://excalidraw.com/
https://www.tldraw.com/
http://figma.com/figjam
http://miro.com
http://mural.com
Here’s an article with some more misc tools
https://medium.com/@giovannipuntil/free-apps-and-programs-that-i-love-to-use-in-2020-526574f297ce
Updated 6/9/2022
Apple Freeform is coming Fall 2022
Here’s an article listing mostly all of them
https://prototypr.io/post/freeform-apples-whiteboard-app-sounds-like-freehand-looks-like-figjam
There’s also the moodboard tool that’s kind of a whiteboard-esque
https://milanote.com/