That’s cool, thanks for your work with this. I’m a regular user.
Was going to say that the John Carter Brown Library (leading research library for rare books, maps, and manuscripts about colonial Americas) uses Luna - they did last time I checked, but seemingly it changed? At any rate it worked well for the past decade or so: https://jcb.lunaimaging.com/luna/servlet
Edit - looks like I got this mixed up with Luna Imaging which I assume is different
The idea was to license the LUNA software to other image collections. I think NASA used it for a bit but that was about it. The problem was it was barely customizable (only color scheme, fonts) and no one had the stomach for how much more work (an order of magnitude at least) it was going to take to make it reasonably customizable for the different layouts/flows/features customers would want.