Ant Design of React
An enterprise-class UI design language and React-based implementation.
[Bonus] Ant Design of React is a React framework from the Chinese company Ant Design; based on the design specifications they have come up for their projects. It features a "complete" set of beautiful UI components built with React, using Material Design principles.
They're looking for volunteers to make their english translations better/complete (the time picker component, for instance, needs translation). Take at look at this issue, if you're interested.