Fancybox - fancyapps.com - Fancy App Store
piZap - Free online photo editing software.
Lightbox 2 - Lightbox is a simple, unobtrusive script used to overlay images on the current page.
FotoFlexer - FotoFlexer is the most powerful online photo editor in existence.
PhotoSwipe - JavaScript gallery, no dependencies.
Fun Photo Box - FunPhotoBox is a free photo editing device where you can make clever pictures from your photographs.