We could dramatically improve functionality of many Moodle reports by adding pivot table capability. This package is an open source, React-based pivot table library:

https://github.com/plotly/react-pivottable

It includes many visualisation tools, as well.

It would be especially helpful to have this as part of a customisable report builder, but it would also benefit log/event reports and other reports that contain interrelated data.

(There is an older version that uses JQuery instead of React, as well.)