Our team's have been using Miro for this kind of collaboration. I was surprised that it felt better than using a whiteboard in person, because the cost of chang

Our team's have been using Miro for this kind of collaboration. I was surprised that it felt better than using a whiteboard in person, because the cost of changing the already drawn boxes and arrows went way down. For more technical whiteboards, I've been using excalidraw. I like presenting the "drawn" look to help imply that this is an unfinished idea and we're sketching the concepts out.