Web components
PatternFly Elements
This is a web component implementation of the Red Hat design system. It leverages the encapsulation of ShadowDOM and the power of custom properties to create well-scoped elements that are still designer-friendly. Elements are accessible, context-aware, and framework-friendly!
Design system
Spectrum CSS
This is a CSS-focused library that expresses the design direction of Adobe's Spectrum design system. It is the foundation of the Spectrum Web Components styling and the internal React Spectrum library.