Show markers and tails for hands. The EZWrite software is free to use. If you have an iPhone sitting in your pocket right now, you have access to one of the most versatile tools you could ever find on a film set. OpenBoard for teachers looking for a free whiteboard app with Jamboard-like features and a comprehensive toolkit to explain complex math concepts. If lighting is your weakness, this app could be a nice crutch until you grow your legs.
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