public domain
Internet Archive
The Internet Archive, a 501(c)(3) non-profit, is building a digital library of Internet sites and other cultural artifacts in digital form. Like a paper library, we provide free access to researchers, historians, scholars, the print disabled, and the general public. Our mission is to provide Universal Access to All Knowledge.
PUBSPACE
Public Library by NASA : https://www.nasa.gov/open/researchaccess/pubspace
Public Domain Audio Libraries
In no particular order …