I’ve been using Rawtherapee since ~2013 and it has its quirks but covers all of my needs.
For panorama/mosaics I’ll process the whole batch of photos in Rawtherapee then do the stitching with Hugin.
The rare times I need to make a spot edit (like removing sensor dirt) I go back to good old Gimp.
Everything is organized in a directory structure by subject/location and date to make it easy to back up and not reliant on a DB or some other software.
It’s not really an integrated solution but it’s simple and works for my low-volume of photos.