iOS Design Kit - The newest library of native iOS templates
Unity - The multiplatform game creation tools for everyone.
Fludish Sketch UI Kit - 🌱 Fluent iOS UI Kit designed for Sketch.
Godot Engine - Feature-packed 2D and 3D open source game engine.
iOS 12 GUI - Free collection of UI components and screens of iOS 12
Blender - Blender is the open source, cross platform suite of tools for 3D creation.