Yotophoto is a search engine for free-to-use stock photographs and images. These are images that are either in the Public Domain or released under generous Creative Commons, GNU FDL or similar licenses. Originally an experiment to facilitate easier image searching of the Wikipedia, Yotophoto eventually expanded to index other well known free image sites. Today, Yotophoto indexes over a quarter million free images. They index various sources of free imagery on the web including Flickr, Wikipedia, Stock.Xchng, Morguefile, Pixelperfect Digital and OpenPhoto.

Requirements: No Requirements
Demo: http://yotophoto.com/
License: Creative Commons License