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Source Wireframe Kit - Library of 537 blocks for desktop and mobile prototyping
UI Flow Cards - Construct web pages with ease, using cards
Contra Wireframe Kit - Open source wireframe kit for design and prototyping 🚀
Wannathis - 3d illustrations and freebies
Platforma - Wireframe library of layouts and UI elements
The User Interview Exchange - Give a user interview, get a user interview - It's all free