- The Internet Archive - One of the largest collections of online public domain media.
- Wikimedia Commons - Wikipedia's image bank.
- Wikisource - An online library of over 233,000 texts.
- Flickr Commons - Contains images from people, museums, libraries and other institutions labeled "Creative Commons" (an open license alternative)
- Project Gutenberg - This contains thousands of public domain texts.
- The Library of Congress - via its American Memory site.
The Public Domain Review is accepting submissions of articles. They are looking for articles about items in the collections but they are also looking for articles about how to use the materials in the collections. This is a good opportunity for teachers, instruction designers, and artists to reconnect students and the public with the historical record of our culture. I would like to see lesson plans developed around public domain materials, much like what we are doing with the course development around the Kaleidoscope grant (a grant that seeks to implement courses using openly licensed texts and learning objects).