FlockDraw is a seamless real-time online collaborative drawing tool. This online drawing tool simply saves your lot of time. You don’t need to go for the professional software like Photoshop for basic wireframes and minor drawings to show your clients or friends.
The good thing in this online drawing tool is; you can share your drawings in real-time. It means while you create a drawing; the person on the other end can collaborate on certain drawing.
Website: http://flockdraw.com/