OpenBoard - The OpenBoard software is an interactive white board software.
Conceptboard - Instant Whiteboards for Teams & Projects
Surface Studio - A brilliant screen for your ideas, from Microsoft
Scribblar - Scribblar is a free online collaboration tool that is perfect for online tutoring.
Twiddla - Mark up websites, graphics, and photos, or start brainstorming on a blank canvas.
Microsoft Whiteboard - The canvas where ideas, content, & people come together.