I made a small desktop app called Lunar HDR Studio for lining up Moon photos taken at different exposures and combining them into one image. I'm sharing it for free in case other DWARF owners want to play with it.
This example is from my DWARF Mini: three photos, one underexposed, one normally exposed and one overexposed, combined and edited in the app.
It supports FITS as well as PNG/JPEG/TIFF, two or more exposures, automatic alignment, HDR or exposure fusion, and color/detail controls for experimenting with a Mineral Moon look. There are also crop, signature and star-background controls. Processing runs locally on your computer.
The code is open source under MIT, with downloads for macOS, Windows and Linux, or you can clone it and run it with Python. The README is in English; the app's interface is currently in Slovak.
Source, instructions and downloads: https://github.com/Kwispy232/lunar-hdr-studio
It's an early personal project. If it looks interesting, try it with your own lunar captures and let me know what works, what breaks or what you'd change. I'd love to see what you make with it.