Source Wireframe Kit - Library of 537 blocks for desktop and mobile prototyping
Contra Wireframe Kit - Open source wireframe kit for design and prototyping 🚀
Platforma - Wireframe library of layouts and UI elements
Platforma for iOS - The ultimate wireframe kit for app prototyping
iOS Wireframing UX Kit - An easy, speedy way to wireframe for iOS
Method Wireframe Kit - Find your method of being incredibly fast in prototyping.