darktable is an open source photography workflow application
Library to encode and decode images in WebP format
ImageMagick 7
A fast image processing library with low memory needs
Swiss army knife of image processing
Lynkeos is an astronomical webcam image processing software for OS X.
Scanning probe microscopy data visualisation and analysis
A collection of packages providing extra functionality for GNU Octave
Resilient Image Library - successor to DevIL
ProStack - a platform for image processing and analysis
Image processing library in C/C++
Tools to access streams in PDF-files at the object level.
Easy converting PNM to (MASK+FG+BG)-pdf.
Easy converting pgm and ppm to (MASK+FG+BG)-djvu.
Improved JPEG encoder
Graphic Live Mixer
Digital image processing programs for Windows and Linux systems.
A small C library for building user interfaces with C, XML and CSS.
Tools to train Image Operators automatically from a set of samples.
Advanced image processing toolbox for Scilab on Unix/Linux/Mac OS