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iOS Design Kit - The newest library of native iOS templates
draw.io - Online diagramming application
Velvet UI Kit - Cozy iOS UI Kit designed for Sketch 🌸
iOS Design Course - The Complete iOS Design Course with Sketch from Bitfountain
Ionic Sketch UI Kit - Smart Sketch library for Ionic 3
Pencil Project - Single-user mockup / wireframing / diagramming tool