Tetrisly - Starter kit for design systems and wireframes builder (Sketch/Figma)
Framer - 🔥 Design real websites right on the canvas.
Material Design Icons - 750 Free open-source glyphs by Google
Material UI - A CSS Framework and a Set of React Components that Implement Google's Material Design
Material Design for Bootstrap 4 - Powerful and free UI KIT for the newest Bootstrap 4 and Material Design
Ant Design - An enterprise-class UI design language and React implementation with a set of high-quality React components, one of best React UI library for enterprises