Stoodle is a very nifty web tool for creating collaborative whiteboards.  It can be used on the iPad or on a desktop/laptop.  No registration is necessary, simple start a new class classroom, share the URL with others, and begin collaborating.  Microphone support allows for audio conferencing between users, and there is also a chat box available.  Type, draw, add images, and more.  Stoodle also allows for multiple pages, so you never run out of room to work.

Stoodle Screen

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