ImageMagick 7
A fast image processing library with low memory needs
darktable is an open source photography workflow application
Swiss army knife of image processing
A collection of packages providing extra functionality for GNU Octave
ProStack - a platform for image processing and analysis
Image processing library in C/C++
Resilient Image Library - successor to DevIL
Tools to access streams in PDF-files at the object level.
Easy converting PNM to (MASK+FG+BG)-pdf.
Libraries and command line tools for medical image processing.
Graphic Live Mixer
A small C library for building user interfaces with C, XML and CSS.
Advanced image processing toolbox for Scilab on Unix/Linux/Mac OS
Video Capture from Windows WDM cameras
Astronomical object/structure detection from 1D and 2D data sets.
Software for data analysis, image processing, simulations, solver.
Heterogeneous Image Processing Acceleration (HIPACC) Framework