Great news for freebie lovers in general, as well as for creative people who can find use for the digitized materials of the Smithsonian Museum in the USA. The CC0 license allows you not only to watch, download, but also use these materials in your creative projects without reference to the source.
Open access to digitized museum materials is a fairly common practice these days, it's just that the Smithsonian has a huge amount of materials posted at once, and they promise to post more. There are also other not well-known places for legal downloading of open files: for example, a huge musical archive of old music https://imslp.org/wiki/Main_Page
Speaking of freebies, it is worth mentioning the famous collection of free books Project Gutenberg https://www.gutenberg.org/
Source: linux.org.ru