Tetrisly - Starter kit for design systems and wireframes builder (Sketch/Figma)
Contra Wireframe Kit - Open source wireframe kit for design and prototyping 🚀
Material Design Kit - Design for Android better and faster
Platforma - Wireframe library of layouts and UI elements
React Rainbow Components - Build your web application in a snap.
Craftwork - A collection of User Interface resources made by Craftwork