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.
Photoshop.com - Photoshop.
PhotoSwipe - JavaScript gallery, no dependencies.
FotoFlexer - FotoFlexer is the most powerful online photo editor in existence.