Surface Studio - A brilliant screen for your ideas, from Microsoft
Explain Everything - Explain Everything is an easy-to-use design, screencasting, and interactive whiteboard tool that...
Twiddla - Mark up websites, graphics, and photos, or start brainstorming on a blank canvas.
Microsoft Whiteboard - The canvas where ideas, content, & people come together.
WrittenUp - A free virtual whiteboard for remote collaboration
Conceptboard - Instant Whiteboards for Teams & Projects