Contra Wireframe Kit - Open source wireframe kit for design and prototyping 🚀
Whimsical Wireframes - Lightning fast wireframing with real-time collaboration.
Platforma - Wireframe library of layouts and UI elements
Wireframe.cc - Sweet and simple online wireframing tool.
Craftwork - A collection of User Interface resources made by Craftwork
Wireframe for Figma - Lightning fast wireframing on figma (500+ elements)