LibRaw is a library for reading RAW files obtained from digital photo cameras (CRW/CR2, NEF, RAF, DNG, and others). LibRaw is based on the source codes of the dcraw utility, though some of the drawbacks of dcraw have been eliminated. The users of the library are provided with an API to be used when writing their software programs.
digiKam is an advanced digital photo management application that makes importing and organizing digital photos a trivial task. Photos can be organized in albums, which can be sorted chronologically, by directory layout, or by custom collections, and they can be tagged, commented, and rated. digiKam makes use of a fast and robust database to store meta-information, which makes adding and editing comments and tags very reliable. Metadata can also be stored inside pictures using Exif and IPTC. An embedded image editor and a standalone application named showfoto have simple but powerful features for editing your pictures with filters and correction tools.
RPhoto is a handy image editor to simplify cropping of digital camera pictures and avoid white borders introduced by incorrect height/width ratios. It also has lossless rotate and flip features, as well as a unique way to rectify a bad angle by only drawing a horizontal or vertical line.
exiftags parses a JPEG file looking for Exif (Exchangeable Image File) data, formatting, and printing image properties. Digital cameras typically add Exif data to the image files they produce containing information about the camera and digitized image. exiftags includes support for some camera manufacturer-specific properties.
Qtpfsgui is an open source graphical user interface application that aims to provide a workflow for HDR imaging. Supported operations include: creations of a HDR file from a set of images of a scene taken at different exposure settings, tone-mapping an HDR image into a common LDR image format (e.g JPEG or PNG), and loading, saving, and rotating existing HDR images.
Bibble is a professional image-manipulation application for processing of raw photos from digital cameras. It provides a fast and high quality raw workflow. It features a fully integrated browser, user configurable tools/views, powerful batch processing, raw optimized printing, a flexible renaming system, advanced settings for copy and paste, IPTC meta-data support, and tethered shooting.