Image matting tool cuts out objects in photos using an alpha-matting technique. While clear cuts can be found for all objects that are clearly separated from their environment, objects with fuzzy borders and semi-transparent areas don't have a clear outline. The tool creates an alpha channel that defines the degree to which the background shines through the foreground for every pixel. The background color can then be subtracted. The user defines a rough boundary of an object with a large brush and a high-quality segmentation is generated. Problematic areas can be edited manually.
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.
Gimp User Filter is a work-alike to Adobe's Filter Factory. It is a generic image processing plug-in that can be used to create new filters for The GIMP without having to go through the process of learning about The GIMP's SDK. Many freely available filters that have been created for Filter Factory can also be used with this plug-in.
ScenePainter is a program for creating comics by (re-)arranging prefabricated graphic elements, taken from a media library. It can also be used as a developer tool for programmers and artists that are building games using threering's nenya library. Currently, ScenePainter does not ship with resourcefiles of its own, but is able to extract graphics from the games "Puzzle Pirates" and "Bang Howdy" by three rings design, inc. These graphics however, are copyrigthed materials and require permission to be used (e.g. for creating fan art).