It is an online whiteboard, where multiple users can sign on and use the whiteboard to jot down their ideas, and add to the images and thoughts of others. If you know of any others, please add them here.
Free Technology for Teachers: Seven Free Online Whiteboard Tools for Teachers and Students
Flockdraw - website states, "is a free to use online whiteboard based painting & drawing tool. It makes it easy to draw online free with multiple people for fun or business. You can have unlimited people in a room and the drawing updates in real time. Uses different colors, shapes and text."
Educreations is a global community where anyone can teach what they know and learn what they don't. They are on a mission to democratize learning by extending the reach of great teaching. This is totally what we are all about!!!!!