ImageMagick 7
Library to encode and decode images in WebP format
darktable is an open source photography workflow application
A fast image processing library with low memory needs
Swiss army knife of image processing
A collection of packages providing extra functionality for GNU Octave
Scanning probe microscopy data visualisation and analysis
Lynkeos is an astronomical webcam image processing software for OS X.
Image processing library in C/C++
Resilient Image Library - successor to DevIL
ProStack - a platform for image processing and analysis
Astronomical object/structure detection from 1D and 2D data sets.
Tools to access streams in PDF-files at the object level.
Collection GIMP plugins by zvezdochiot
Easy converting PNM to (MASK+FG+BG)-pdf.
Easy converting pgm and ppm to (MASK+FG+BG)-djvu.
Improved JPEG encoder
Libraries and command line tools for medical image processing.
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.