SciPy library main repository
A standalone, large scale, open project for 2D/3D image processing
A fast image processing library with low memory needs
High performance Node.js image processing module
itom - an Open Source Measurement, Automation and Evaluation Software
Scientific Visualisation Made Easy
Emgu CV is a cross platform .Net wrapper for OpenCV
High performance image processing library in C++
A small C library for building user interfaces with C, XML and CSS.
Multi-platform API for Image Processing systems in Life Sciences