Lo-fi Wireframe Kit for Figma - Free component library that helps you explore ideas, faster
Source Wireframe Kit - Library of 537 blocks for desktop and mobile prototyping
Sections Wireframe Kit - Biggest library of layouts for web prototyping
Contra Wireframe Kit - Open source wireframe kit for design and prototyping 🚀
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
Platforma - Wireframe library of layouts and UI elements