I have I have tried a few things and found that the ones that work best are Google Drawings, RealTimeBoard, Moxtra (now with LTI integration) and Web Whiteboard. It depends on what you are doing, but I like Google Drawings the best. They can be embedded on pages and worked on collaboratively. Students can start a drawing, submit it as their assignment in Canvas and teachers can work directly on the drawing or share feedback via comments. Teachers can start a drawing and share it so that students can view only, then students can make a copy and add their own annotations or drawings and submit it as a PDF or PNG in Speedgrader so that teachers can use all the awesome features there to give feedback, grade with rubrics, share video comments, etc.
Check out this example here: Canvas Test - Google Drawings
What do you think? Will this work for what you need?
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