Increíble la pila de software libre orientado a la fotografía que han comentado en DIY Photography. La mayoría del software que citan está únicamente disponible para sistemas Windows, pero no por ello podemos descartar todas las posibilidades, de hecho, en los comentarios podemos encontrar cosas así:
Rawstudio : http://rawstudio.org/
Rawstudio is an open-source program to read and manipulate RAW images from most digital cameras.
jdlRaw : http://jdlraw.sourceforge.net/
jdlRaw manipulates raw images from digital cameras and is based on dcraw and imagemagick. It does exposure correction, curve application in RGB/CIELAB space and USM/Refocus sharpening. Includes also lensfun and noise reduction algorithms.
Fotoxx : http://kornelix.squarespace.com/fotoxx
Navigate a large image collection using a thumbnail browser. Import camera RAW files and edit with 16-bit color. Save edited images as TIFF-8/16, PNG or JPEG with adjustable compression. Edit the whole image or a selected area, with adjustable edge-blending. Edit functions have live feedback using the full window. Undo/redo up to 99 edits. Add tags, dates, and star-ratings to images and search using these criteria and (wildcard) file names. Fotoxx does not use filters, layers, and masks – the edit functions work directly on the image.
Geeqie : http://geeqie.sourceforge.net/
Geeqie is a lightweight image viewer. It was forked from GQview. The development is focused on features for photo collection maintenance: raw format, Exif/IPTC/XMP metadata and integration with programs like UFraw, ImageMagick, Gimp, gPhoto or ExifTool.
Mapivi : http://mapivi.sourceforge.net/mapivi.shtml
Mapivi is a photo management tool with focus on JPEG pictures. Mapivi supports adding, editing and searching of IPTC/IIM, EXIF data and JPEG comments. The pictures are managed in place (in your folder structure), so you are able to use other tools like file managers or other viewers together with Mapivi.
Linux, Mac and Windows
PhotoPrint : http://blackfiveimaging.co.uk/index.php?article=02Software%2F01PhotoPrint
PhotoPrint is a utility designed to assist in the process of printing digital photographs.
Linux and Windows.
LPROF : http://lprof.sourceforge.net
LPROF is the only open source ICC profiler with a graphical user interface. It can be used to create ICC version 2 compliant profiles for cameras, scanners and monitors. As such it fills a necessary niche in the emerging open source color management effort. Windows, Mac, Linux
ExifTool : http://www.sno.phy.queensu.ca/~phil/exiftool/
ExifTool is a platform-independent Perl library plus a command-line application for reading, writing and editing meta information in a wide variety of files. ExifTool supports many different metadata formats including EXIF, GPS, IPTC, XMP, JFIF, GeoTIFF, ICC Profile, Photoshop IRB, FlashPix, AFCP and ID3, as well as the maker notes of many digital cameras by Canon, Casio, FujiFilm, HP, JVC/Victor, Kodak, Leaf, Minolta/Konica-Minolta, Nikon, Olympus/Epson, Panasonic/Leica, Pentax/Asahi, Ricoh, Samsung, Sanyo, Sigma/Foveon and Sony.
Linux, Windows, Mac
Exiv2 : http://www.exiv2.org/
Exiv2 is a C++ library and a command line utility to manage image metadata . It provides fast and easy read and write access to the Exif , IPTC and XMP metadata of images in various formats . Exiv2 is available as free software and with a commercial license, and is used in many projects .
Linux and Windows
Dicho así, os recomiendo daros una vuelta por esa entrada, seguro que podréis darle un buen uso a programas que aun no conociais.