Hahh, véletlenül találtam: GIMP is now capable of using darktable

On Linux, GIMP is now capable of using darktable for pre-processing raw images from DSLRs (Canon CR2, Nikon NEF etc.). darktable is an amazing project whose developers stick around at our IRC channel and even contribute to GIMP (most recently, they added reading various metadata from EXR files).

http://www.gimp.org/news/2016/07/13/gimp-2-9-4-released/