For me, Wacom tablets or tablet-with-stylus kinds of devices.

Now it's not only a whiteboard, but I can take screenshots, collaborate with countless others, undo, search, zoom and pan infinitely, etc...

And they can be had for around $100 or less.

Plenty of real-time whiteboarding tools. Something simple like a shared google doc works well for 90% of it.

Which collaborative whiteboard solutions do you like?

We use https://www.notion.so/ for notes, tasks, wiki and project management. Google Docs for quick stuff or formal writeups.

Occasionally we'll use OneNote online or https://awwapp.com/ which has more freeform drawing if we need it, but otherwise it's usually just typing stuff out in lists.

This is all on peoples computers, no fancy video-conferencing setups. Those are almost always a waste of money and never work well.

Hrm. None of these really seem like whiteboarding though.

I'm not sure what you mean then, what is whiteboarding exactly?

Using whiteboard and notepad features of the collaboration tool. Which are legible and visible to everyone all the time, not just if you're looking over somebody's shoulder

I suppose you could point a webcam at the whiteboard, although there are a lot of options out there for online collaboration. We use MS stuff at work and multiple people can live-edit Word, One Note, etc. docs for example.