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BlackBerry OS 10 was my favourite one. They way it used widgets and gestures was really cool. Hub application was awesome. Android and iOS copied a lot of it later but I liked how simple and minimalistic BBOS10 was compared to them. Never tried developing for it though.
But that was the old OS, right? Not the BB 10? I’m talking about phones like Q10, they were completely different from the old phones with cursors.