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.
Draw.Chat - Anonymous real-time whiteboard with text and video chat.
Crucial Human Stickies - A fun visual way to curate, organize, and manage your work
Weje - Organize your ideas & projects into white boards without limits