Scribblar: A Free Online Multi-user Whiteboard
If you are online training or tutoring, and you need an interactive whiteboard, you may want to explore Scribblar. Scribblar is a free online collaborative whiteboard designed for multi-user use.
In Scribblar, users in a single room can use the same whiteboard to draw and react on objects on the screen. A snapshot of the whiteboard can be taken for filing and later work. In addition, Scribblar also supports text and live audio chat.