iOS Design Kit - The newest library of native iOS templates
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
iOS 12 GUI - Free collection of UI components and screens of iOS 12
BuildFire - BuildFire is the easiest way for small businesses to build a mobile app in a matter of minutes for iOS and Android.
Fludish Sketch UI Kit - 🌱 Fluent iOS UI Kit designed for Sketch.
MIT App Inventor - App Inventor is a cloud-based tool, which means you can create apps for phones or tablets right in your web browser.