Dear all
I am using kstars for image acquisition with INDI on Astroberry Server. kstars does a fine job of displaying FITS files, but when I double click on a FITS file it will open a new kstars instance, which can be quite confusing if there is already a kstars instance running for imaging.

Therefore I'm looking for another application to open my FITS files. It should be lightweight, therefore no bells and whistles required, just some basic capabilities such as autostretch etc. I tried to install Siril (which might actually be a bit overkill for my needs) but to no avail.

Any suggestions?
Thanks,
vega72