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
Lynkeos is an astronomical webcam image processing software for OS X.
Astronomical object/structure detection from 1D and 2D data sets.
Resilient Image Library - successor to DevIL
ProStack - a platform for image processing and analysis
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.
Tools to train Image Operators automatically from a set of samples.
Advanced image processing toolbox for Scilab on Unix/Linux/Mac OS
Standalone tool for taking pictures out of your webcam
Bildster is an image processing library for educational purposes.
A Library for Interactive Modelling and Visualisation
Python-accessible toolkit for Geoscience & Remote Sensing Applications