Carbon Design System is a complete set of UI components designed for IBM’s Cloud Platform and recently released on GitHub. Carbon is available for designers and developers, as Sketch file and in form of HTML and SCSS component library.
Carbon design kit
The Carbon design kit is basically a living and comprehensive kit of the Carbon Design System visual assets (components, iconography, color palettes, grids, templates). Available as Sketch file.
Carbon component library
On the other hand, the Carbon component library provides front-end developers & engineers a collection of reusable HTML and SCSS partials to build websites and user interfaces. That enables developers to use consistent markup, styles, and behaviour in prototype and production work.
Here’s a preview of what you can find in Carbon: