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Re:Show HN: Beyond Tabletop – An RPG Tool Built on Google Drive by tmfkmoney on Thursday September 18, 2014 @09:57AM (#8335201)
Beyond Tabletop is designed to let you use your mobile devices for in-person gaming.

A friend and I built this after we bought dry erase mat for our home game. We realized that we had a dozen mobile devices in the room and we were still using pen and paper for gaming.