Plectica - Easily diagram anything, together
Samsung Flip - A 55" digital white board from Samsung
Diagrams for Mac - A diagram editor for visualizing structures and processes
Witeboard - A real-time whiteboard for your team. No signups required.
Overflow for Windows - The world’s first user flow diagramming tool for designers
Sketchboard.io - Visual Remote Teamwork. Solve problems and create ideas on endless whiteboard with your teammates by sketching.