There is something called Oekaki Poteto, which is open source, and allows for drawing. I've never installed it myself, but it seems to me that perhaps there might be a way to pre-insert an image into the Oekaki and then be able to draw on it? I would be interested in seeing someone incorporate this into Moodle. I'm not a programmer, but I would be happy to test it if someone could do it.
General plugins
something cool: annotative collaboration
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