Wikimedia Commons Search for photos, each has ddifferent licensing, so check before you use.
Arkive "Images of Life on Earth"
EduPics Free phoptographs nd graphocs for education
FreeDigitalPhotos.net Royalty Free Images
Gimp Savvy Community Indexed Archive of photos from NOAA (National Oceanic and Atmospheric Administration) , NASA, and FWS (Fish and Wildlife Service)- all royalty free
Grunge Textures Free high resolution textures for graphic design and digital art
Morgue File free images
National Education Network Gallery pictures, sound, and video
Photo Take Out free digital stock photos
Stock Vault free stock photos
UnProfound Photos- searchable by color!
USDA U.S Dept of Agriculture- public domain images
Library of Congress American Memory Museum-The Library of Congress has great primary sources for you to use in your projects. Just because it's on a government website doesn't mean it's necessarily public domain. However, abiding by Fair Use guidelines, students should be able to use these resources
National Archives There is more here than you ever imagined.....and the number of digital resources is ever growing!
Karen's Whimsy (description from website): On the following pages you will find hundreds of beautiful images gleaned from my collection of old books, magazines, and postcards. They are all from material printed prior to 1923 and are in the public domain
Public Domain Pictures is a repository for free public domain photos. You can upload your own pictures and share your work with others.
WP ClipArt is a fast, clean and safe site for children and others to find good-quality, printable images that have no copyright restrictions. All the images are in the Public Domain. Ads on pages are minimal to make the site as fast as possible. While there are literally thousands of "fun" images -- I take great pains to find, edit and retouch images of historical and/or general educational value.
Clipart ETC Clipart for Students and Teachers
Open ClipArt Library Clipart resource
UVic Language Teaching Images Clipart and images for teaching vocabulary