GNU Imp
The GNU Image Manipulation Program
The interface for this program is nuts. I’m sure it all makes sense for historical reasons or something, but I just find it completely non-intuitive.
However, it’s a very powerful and capable program. Have patience and look stuff up. Learn how to do the common actions like crop, rotate, and scale.
I give a hearty THANKS! to whichever developer(s) added the "Overwrite foo.jpg" option to save changes quickly in the original file format. That was my biggest gripe and I know I was not alone. :-)
"GNU Imp?"
I’ve taken to writing "GNU Imp" rather than the more common "GIMP" because because that name seems to now be considered problematic in certain circles. Despite having many meanings, that word can be used as derogatory slang. I’m not endorsing this view, but calling it "GNU Imp" amuses me and costs nothing, so why not?