Steam: https://htmlstream.com/preview/stream-ui-kit/
Material Kit: https://demos.creative-tim.com/material-kit/index.html
Solid Design: https://docs.vantage-design.com/solid/demo/
Pixel: https://demo.themesberg.com/pixel-bootstrap-5-ui-kit/
Soft UI: https://demos.creative-tim.com/soft-ui-design-system/index.html