LibPuzzle - Find visually similar images
http://libpuzzle.pureftpd.org/project/libpuzzle
Pixastic Image Processing Library - Javascript
http://www.pixastic.com/lib/
Image Recognition with Neural Networks - How To
http://neuroph.sourceforge.net/image_recognition.html
Liquid FX - Javascript Image Transition
http://www.3site.eu/examples/liquid/
Content Aware Image Resizing - Javascript
http://labs.pimsworld.org/wp-content/uploads/2009/04/demo-content-aware-image-re...
jQuery ThreeSixty - Rotate Images
http://www.mathieusavard.info/threesixty/demo.html
Javascript Image Caption
http://lab.arc90.com/2006/07/image_caption_1.php
jQuery Captify - Image Captioning
http://masterfidgeter.com/projects/captify/
jQuery Zoom Image
http://www.eyecon.ro/zoomimage/
PHP and GD : Emulate Gradient Fill
http://planetozh.com/blog/my-projects/images-php-gd-gradient-fill/