CineSync
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cineSync is a tool for visual communication, built on QuickTime Player. It enables you to draw and write on media files that are played back in perfect synchronisation with anyone you have invited to your cineSync session. Multiple people around the world can view the same material at the same time and they see exactly what you see, frame for frame, image for image, drawing for drawing. It's as though everyone were looking at the same screen no matter where in the world they are, no matter how limited their Internet connection.
cineSync is developed by Rising Sun Research, a company specialising in the development of tools for visual professionals.