Scriblink – Your Online Whiteboard. ‘Scriblink is a free digital whiteboard that users can share online in real-time. Sorta like pen and paper, minus the dead trees, plastic, and the inconvenience of being at the same place at the same time.
We are all about collaboration. Whether you’re here for pure artistic enjoyment or more practical matters such as layout planning, concept diagramming, or tutoring a friend in math, Scriblink brings you the power of free hand expression with anyone, at anytime, anywhere in the world.
On the homepage you’ll be immediately directed to a Scriblink board, which is free and requires no registration. The board allows you to invite up to five people at a time to join you, either through email or directly by copying and pasting the URL.’
Scriblink: The Official Blog