Quite a list, Sandy!
Of those, I too have RawTherapee - now up to V5.5
The GIMP, 16-bit V 2.9 by
Elle Stone - a scion of color management
Elements 6 on a disk somewhere - never use it these days.
The GIMP ** is useful for it's color de-composition function - for example splitting into 3 layers showing hue, saturation and value (brightness). Not the easiest of User interfaces.
RawTherapee has more of everything! Again, not easy.
I also have
FastStone Viewer which has a really good comparator - perfect for weeding out my many bad shots ...
** I say "the GIMP" because that is how it's commonly said, being short for:
"the GNU Image Manipulation Program"
https://www.gimp.org/
Looks like V2.10 is out ... tempting!