We use the whiteboard feature on Zoom. I prefer a wacom tablet and others prefer an ipad with a stylus. Not sure if both of those violate your goal. The thing i

We use the whiteboard feature on Zoom. I prefer a wacom tablet and others prefer an ipad with a stylus. Not sure if both of those violate your goal. The thing is: it is hard to draw with a touch pad, it is hard to draw with a mouse, it is hard to draw with limited surface real estate. Pretty much anything that you can get a shared "doodle" board will work. There are online cooperative doodling programs that can be leveraged. Just remember to do screen grabs before you toss what y'all drew :)