Open Source digiKam Alternatives
digiKam is described as 'Professional digital photo management software to organize, tag, compare and process photo collections'. There are more than 50 alternatives to digiKam for various platforms. The best alternative is darktable, which is both free and Open Source. Other great apps like digiKam are Shotwell (Free, Open Source), Piwigo (Free, Open Source), gThumb (Free, Open Source) and qView (Free, Open Source).