Samsung Flip - A 55" digital white board from Samsung
Allo.io - Whiteboarding, documentation, and video chat in one place.
Witeboard - A real-time whiteboard for your team. No signups required.
Butter - Butter is a newly launched chatting application that focuses more on the privacy of its users.
Sketchboard.io - Visual Remote Teamwork. Solve problems and create ideas on endless whiteboard with your teammates by sketching.
Draw.Chat - Anonymous real-time whiteboard with text and video chat.