I used the YUI framework back in the days for "backoffice" / "admin" pages. It was one of the most productive frameworks. It had a lot of really good abstractions around dom manipulations, data sources and events.

It also had an amazing set of components including an awesome charts library. The data table was state of the art at the time, and could probably beat many of the react tables that are made today. From my point of view it was so much better than most of the alternatives, but it had the negative stigma of a Yahoo ownership.