grat
Member
Darktable is a good app-- I use it for photo management, inversion, and light editing. The interface is a bit quirky, but relatively consistent. The retouch module shows some flashes of genius, but is excessively complex to use in practice.
GIMP is a good tool when you have nothing else. If you're familiar with Photoshop, or even Affinity, the GIMP interface will have you yelling incoherently at your monitor. I'd rather use Krita, in spite of it's memory issues. GIMP is very powerful-- but not easy to use for complex editing.