darktable is an open source photography workflow application
Advanced PNG optimization program
Various small and useful command-line utilities
A lightweight, cross-platform image manager
Library and tools for dealing with the RLE raster image format
Multi-view camera description format for OpenGL visual computing
The Utah Raster Toolkit 3.0, patchlevel 2
Hyperactive S/W for HTML-Thumbnail generation in C
Python-accessible toolkit for Geoscience & Remote Sensing Applications