The Digital Comic Museum archives ‘Golden Age’ comics that are in the public domain.
Google Books has a collection of old books and magazines. When you search, use the “full view” option to find materials that you can read and download in their entirety. You might also want to use the “date range” option to narrow your search to a specific range of publication dates.
The Gutenberg Project has also digitized many copyright-expired books and provides them in various formats for download or screen-reading. Because copyright laws vary different sites exist for Canada, US, UK and other countries.
The David Rumsey Map Collection is a collection of more than 20,000 historical maps documenting places throughout the world. The maps can be searched by area, by time period, or by cartographer. The David Rumsey Map Collection is also available as a Google Earth layer.
~ copied from Free Tech for Teachers
The Commons on Flickr (Previous post) is a good resource for students in need of images for multimedia projects for history, literature, and other content areas. A requirement of contributors to The Commons is that all images are made available without copyright restrictions. Here is a list of institutions contributing to The Commons.
Any search on Flickr can be modified to include only images that are sharable by using the Advanced Search and clicking on “Only Search within Creative Commons Content”.
By Phil Moore on Flickr
Gimp Savvy Copyright-Free Photo Archive - from three main sources: the National Aeronautics and Space Administration (NASA), the National Oceanic and Atmospheric Administration (NOAA), and the U.S. Fish and Wildlife Service (FWS).
The DHD Multimedia Gallery has a collection of images, music, sounds, etc.
Browse the Wikimedia Commons by topic, location, type, author, license or source for images, sounds and videos.
Mashable has a good post here with descriptions of 26 sources for free multimedia.
Clip Art and Historical Comic Strips
There is no registration required (Yay!) at PD Clipart – a very large collection of public domain clipart.
Another large collection at the Open Clip Art Library also permits image editing.
The Comic Strip Library is an archive of stips predating 1923.
If you know of other, especially better resources in the public domain, please share.