It has been many years since I have used any Adobe software.
On my Debian Linux machine, I use rawtherapee, graphicsmagick, exiftool, gimp, and hugin. I sometimes experiment with others and have used darktable in the past.
On my iMac, I use Canon DPP, gimp, exiftool, and graphicsmagick. I have occasionally used Apple Photos.app.
On both my iMac and my Debian machine, I use ksh as my login shell and use ksh scripts and command lines to manage storage, copy files, make backups, make folders to contain files, and search for files because I have been using ksh since 1987 and I am slow to change. On my iMac, I also use timemachine for backups.
Most of my storage is attached to the Debian machine and shared via SMB.
For the answers to why, I use DPP because I have only Canon cameras now and usually use Canon lenses and like the DPP digital lens optimizer and DPRAW tools. I have been using gimp since it first started, so now I use it because I am familiar with it and it is free software. I use graphicsmagick because I like to use a command line for some things. I use exiftool to view and add to the image metadata and seems to me the best tool available. I use hugin when I make a panorama and sometimes when I make an image stack because it is free software and seems to be the best tool available. When I am not using a Canon lens, I use rawtherapee instead of Canon DPP because the rawtherapee "capture sharpening" includes a Richardson/Lucy deconvolution that is nearly as good as the digital lens optimizer in Canon DPP.
I experiment with dcraw_emu and gmic command lines and use the gmic plugin for gimp when I am curious how something works. Sometimes I build free software from source code, but usually no longer write my own programs.
