Platforma - Wireframe library of layouts and UI elements
Previewed - Beautiful mockups & graphics for your next app
Contra Wireframe Kit - Open source wireframe kit for design and prototyping 🚀
Mock - Instantly create video mockups from screen recordings
Source Wireframe Kit - Library of 537 blocks for desktop and mobile prototyping
Cleanmock - Create stunning mockups that make your design standout.