[senko]

Miro works well for this, you don't need to use it as a diagramming tool.

AWW was awesome at this, free-form drawing was the default, you'd just doodle whatever you wanted, no structure required.

[happymellon]

I disagree about Miro, it is definitely a diagramming tool.

Jam is shared Paintbrush, so everyone sketches like a whiteboard which sounds like the AWW you mention.