Platforma - Wireframe library of layouts and UI elements
Contra Wireframe Kit - Open source wireframe kit for design and prototyping 🚀
Method Wireframe Kit - Find your method of being incredibly fast in prototyping.
Craftwork - A collection of User Interface resources made by Craftwork
Invision - Prototyping and collaboration for design teams
Mobile Chat Kit - UI kits & sample apps for building in-app mobile chat