"TinEye is a reverse image search engine. It finds out where an image came from, how it is being used, if modified versions of the image exist, or if there is a higher resolution version."
"Compfight is an image search engine tailored to efficiently locate images for blogs, comps, inspiration, and research. We make good use of the flickr™ API, but aren't affiliated with flickr."
"Hello. My name is Tayler. I built this site to make it easier for me and others to find images on the web.
The site searches and displays results from Wikimedia Commons, an enormous repository of images and other digital resources.
Searching Wikimedia Commons instead of another site like Google Images provides a benefit for people who want to use the digital resources legally.
All resources displayed in the search results on this site link directly to the resource's usage rights page. That page will help you decide whether you can use the resource elsewhere.
Searching for images here instead of going directly to Wikimedia Commons just provides a simpler interface. Search results appear in the easy-to-digest format that we've all grown accustomed to. It combines the great resources of Wikimedia Commons with the interface of Google Images."
"
Wikimedia Commons
a database of 23,559,293 freely usable media files to which anyone can contribute"
"totally free photos for your commercial & personal works"
"VINTAGE PHOTOS FROM THE PUBLIC ARCHIVES
FREE OF KNOWN COPYRIGHT RESTRICTIONS."
"FREE HIGH-RESOLUTION PICTURES YOU CAN USE ON YOUR PERSONAL AND COMMERCIAL PROJECTS.
CLICK ON AN IMAGE TO DOWNLOAD THE HIGH-RESOLUTION VERSION. NEW AWESOME PICTURES ADDED WEEKLY!
ALL PICTURES WERE CAPTURED BY RYAN MCGUIRE OF BELLS DESIGN AND FREE OF COPYRIGHT RESTRICTIONS."
"Welcome to bigfoto.com, the royalty-free photo agency.
This site really does offer you free download of all the pictures in our massive and constantly growing photo gallery. You can use these images just as you wish for personal or commercial purposes (see Copyright for details) and there are no watermarks or complicated rules."
"Rgbstock.com is created by a group of enthusiastic photographers and graphic artists. Our vision is to build the best free stock image site on the web. We are dedicated to making high quality images available to those who cannot afford to pay for them. "