iOS Design Kit - The newest library of native iOS templates
Bots UI Kit - Fully customizable Sketch UI Kit for Messenger Platform
iOS 9.3 UIKit - Most up-to-date iOS 9.3 UI Kit for Sketch and AI
Landing UI Kit - Handcrafted UI components for landing pages
Chat UI kit by InVision - A beautifully minimal app UI kit (Sketch & Photoshop)
Dashboard UI Kit - A modern & responsive dashboard UI kit for designers.