Contra Wireframe Kit - Open source wireframe kit for design and prototyping 🚀
Elements for Sketch - High-quality UI Kits in Sketch, for free
Chat by Stream - Build and ship in app messaging in a few hours
Tailwind CSS - A utility-first CSS framework for rapidly building custom user interfaces.
Craftwork - A collection of User Interface resources made by Craftwork
DynaMaker - Cloud service for Visual Product Configuration with parametric geometry and CAD / BIM