In reply to Blue Straggler:
I used Photopad for non serious editing in JPEG when I dfigitalised my slides, I assume it works with RAW too. You could rotate the image any way you wanted in increments of 1 degree, perfect for straightening.
it had also all the other basic features for editing , retouching, balancing colors, exposure, cropping, etc.
it was a good learner tool.
I paid a one off fee of about 16 £. used it for years. Still in my desktop and rarely used but still working perfectly.