Root UI Kit - Wireframe & design starter kit 🛠️
Invision - Prototyping and collaboration for design teams
Figkit - Figkit is a wireframe library for Figma to communicate and design great user interfaces for desktop and mobile.
Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
Sections Wireframe Kit - Biggest library of layouts for web prototyping
Craftwork - A collection of User Interface resources made by Craftwork