Platforma - Wireframe library of layouts and UI elements
Apple Watch UI Kit - Quickly create Apple Watch app prototypes
Contra Wireframe Kit - Open source wireframe kit for design and prototyping 🚀
MockMagic - A free, easy-to-use device mockup generator
Source Wireframe Kit - Library of 537 blocks for desktop and mobile prototyping
Module 02: Layouts - Professional toolkit for UI/UX design