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Pivot is the only one built specifically for Druid. Preset/Superset is probably the most common tool outside of Pivot. Rill also has a commercial offering that is based on Druid, but I am not very familiar with it.

Thanks Benjamin, I suspected as much. I used Pivot many years ago and was looking for the source code but I think it's now a proprietary product, probably a single page application using React written in JavaScript?

It is JS, I don’t think it is React, but there are people on here that know much more about the inner workings than I do.

Thanks @Benjamin Hopp and have a great holiday! I'm going to start going through the open source Druid code, I have it running in a Docker image on my Mac, great fun!