We've done two rounds of iPhone Duo app picks so far, and now we're back with an overview of some of the best Duo apps you can get for free. MacRumors videographer Dan Barbera demos his suggestions for apps worth checking out. Subscribe to the MacRumors YouTube channel for more videos. Dan's list includes Delta Game Emulator, Bear, Fantastical, MD Vinyl, and several more. The apps are free or…

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