Google has released hundreds of material icons (crafted symbols for common actions and items) with a Creative Commons license. You can use any of these icons if you attribute the Google Material Design project and Share Alike (include the same open license).
Search millions of photographs from the LIFE photo archive, from the 1750s to today. The images include famous personalities as well as photos of American history and Americana. These are for personal, non-commercial use only.
The Metropolitan Museum of Art has made over 375,000 images of public domain artworks available for free and unrestricted use. Images include treasures owned and displayed by the Met such as famous paintings, armor, statues and art objects. Search the digital catalogue.
NASA has high resolution image collections available on their website. Here you can find images of the moon landing, astronauts, space shuttles, astronomy picture of the day and more. Most NASA images are not copyrighted; take a look at the image information to be sure.
Most of the NOAA photos are in the public domain which means that there is no fee for downloading any of these images. Credit should be given to the National Oceanic and Atmospheric Administration and the photographer if noted.
This is a copyright-friendly image library for teachers and students. The collection has thousands of images that have been donated by students, teachers, and amateur photographers. Permission has been granted for teachers and students to use any of the images.
This site provides a repository for free public domain images. Download high quality HD photos for your projects and presentations. There are a few professional photos that have a cost, so watch the terms below each picture.
The U.S. Fish and Wildlife Service's digital media library has an assortment of selected images, video and audio clips that are in the public domain. You are free to use them as you wish - no permission is necessary. Please give appropriate credit or citation.
The US Dept of Agriculture has a collection of high resolution photos available for download and organized into categories (crops, animals, insects, food, plants, and more). The 2,000+ images in their galleries are copyright-free, public domain images unless otherwise indicated.
This is a database of media files (images, sound, video) that are freely available for use. Use the Search box at the top or browse topics listed on the right side. Scroll to the bottom of the page for tips on browsing, using, identifying or creating files.