- https://design-system.service.gov.uk/

- https://bbc.github.io/gel/

- (not strictly design system s) https://every-layout.dev/ and https://book.inclusive-components.design/

These are by people whose primary goal isn't promotions, keynotes or CVs.

Tailwind also does a decent job with both the framework itself and the commercial UI examples: https://tailwindui.com/