Root UI Kit - Wireframe & design starter kit 🛠️
Anima App - Design, get feedback, convert to code, publish, iterate.
Figkit - Figkit is a wireframe library for Figma to communicate and design great user interfaces for desktop and mobile.
Sketch Repo - Collection of resources for anyone who uses Sketch
Sections Wireframe Kit - Biggest library of layouts for web prototyping
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.