From Iteral Groud:
IDroo is an online educational multiuser whiteboard. You can draw and write your ideas, express your mind through images, take advantage of high quality calls over Skype, and work with Wacom Bamboo, Wacom Intuos and other digital tablets. You can easily teach math to a student or to your own child remotely with the professional math typing tool. You can use pictures to illustrate your ideas. You can load images from a disk, paste them from the clipboard, or drag-and-drop directly into the IDroo window.