darktable is an open source photography workflow application
Library to encode and decode images in WebP format
ImageMagick 7
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++
Graphic Live Mixer
Tools to train Image Operators automatically from a set of samples.
Advanced image processing toolbox for Scilab on Unix/Linux/Mac OS
Bildster is an image processing library for educational purposes.
A Library for Interactive Modelling and Visualisation
Heterogeneous Image Processing Acceleration (HIPACC) Framework
LBP implementation in multiple computing platforms (ARM,GPU, DSP...)