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Education users
Professors, students and teachers are free to use it in classroom presentations and demos, dissertations and other non-commercial academic works, researches and all related not-for-profit activities. The use of our files is still bound by a license but its use is completely free as long as:  
(1) the downloaded image is used according to its terms and conditions;
(2) humanline.com is accredited as the source by a credit line or an active link to our website; and
(3) it is not distributed to third parties.

via http://www.freetech4teachers.com/2012/04/humanline-thousands-of-historic-images.html

Welcome to Smithsonian WILD! This site is designed to showcase some of the exciting research conducted by the Smithsonian Institution and its collaborators around the world, and to highlight the incredible diversity of wildlife that exists in a range of habitats across the globe. 




The use of motion-triggered 'camera traps' has become an incredibly useful tool for scientists to answer an enormous range of conservation and ecological questions. Researchers attach these unique cameras to posts or trees, often along forest trails, and when a camera's sensor registers an animal's body heat and movement, a photograph is taken. The studies highlighted here demonstrate the range of applications of this method, and how these cameras give us a glimpse into an animal world that is rarely seen by anyone. You can search the site by following the trail of interesting animals or the lure of diverse sites around the world.

Decades worth of historical video footage available for download.  Could be good green screen video options. 

resize pics online

Search for CC photos free to use and modify via Flickr

Use zoom.it to take photo and zoom in & pan around.  Could be a great tool for discussions or even writing prompts.

Custom search engine for finding image appropriate sites.

Great site for finding images for use in presentations and projects under the Creative Commons agreement.