"GIMP plugin called Liquid Rescale is a free, open source frontend to the Liquid Rescale Library, which provides an implementation of the Seam Carving algorithm"
"If you have created or found iMacros that you think might be useful to others, simply tag them “for:imacros”. We will review the submissions and add the best ones to our collection for all iMacros users to enjoy."
"MathMap is a GIMP plug-in which allows distortion of images specified by mathematical formulae. For each pixel in the generated image, a script is evaluated which should return a pixel value."