There are Styling Systems, and there are Component Libraries…
Some component libraries come with an opinionated styling system. Others are agnostic.Styling systemsComponent libraries
There are also low-level libraries that help to make your own components.
Such as: floating-ui.com
And independent components that are not an entire library, but maybe worth installing: rehype-pretty-code.netlify.app
Manage your own library
Most companies choose to build their own component library:
A library of icons is very useful: