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Platforms: iPad/iPhone, Roku, and the web
As with its programming aimed at adults, PBS streams a large selection of its Kids' shows. The free series available here include Arthur, Clifford the Big Red Dog, Caillou, Curious George, The Electric Company, Sesame Street, and dozens of others. Stream shows to your computer or TV (via Roku, where it's in HD), or keep kids occupied with the free PBS Kids apps for iPad/iPhone.