seele - Standard Extensible Elements
Seele (Standard Extensible Elements) is a extensible Web Components library with a focus on accessibility and keyboard-control.
It also provides styled components in the following design guideline(s):

Features
What’s the differences comparing to other projects?
- Accessible and keyboard-accessible - all components are based on the APG Patterns
- Flexible - seele provides not only the styled components, but also the base ones and the mix-ins that compose them, allowing you to write your components easily
- Up-to-date - seele uses new Web features as much as possible, (see the README), meaning that its size is relatively small and the compatibility is not the best
Documentations
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Similar Projects
- Material Web - similar to seele, this project uses Lit but is dedicated to Material Design instead of a generic library and developed by Google developers
- M3E - also built on Lit and has a rather complete component collection
- MUI (Material UI) - tried-and-tested React component library, supporting only Material Design 2
- Vuetify - tried-and-tested Vue component library, supporting only Material Design 2
- MDUI - Lit, Material Design 3, not much accessible but definitely complete