IMagick is a native PHP extension to create and modify images using the ImageMagick API. Documentation for the extension is available here.
phMagick is a wrapper class for ImageMagick, wrapping the most common web image manipulation actions in easy to use functions, but allowing full access to ImageMagick's power by issuing system calls to it's command-line programs.
Wand is a ctypes-based ImagedMagick binding library for Python.
PythonMagick is an object-oriented Python interface to ImageMagick.
PythonMagickWand is an object-oriented Python interface to MagickWand based on ctypes.
Scilab Image Processing toolbox utilizes ImageMagick to do imaging tasks such as filtering, blurring, edge detection, thresholding, histogram manipulation, segmentation, mathematical morphology, color image processing, etc..