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iOS Design Kit - The newest library of native iOS templates
Whimsical Wireframes - Lightning fast wireframing with real-time collaboration.
iOS Design Course - The Complete iOS Design Course with Sketch from Bitfountain
Wireframe.cc - Sweet and simple online wireframing tool.
Xcode - Xcode is Apple’s powerful integrated development environment for creating great apps for Mac, iPhone, and iPad. Xcode 4 includes the Xcode IDE, instruments, iOS Simulator, and the latest Mac OS X and iOS SDKs.
Wireframe for Figma - Lightning fast wireframing on figma (500+ elements)