Old Book Illustrations offers a wide range of public domain, royalty-free restored images scanned from old books. Searchable galleries include animals, plants, etc.

Data about The Met collection, including over 492,000 images of public-domain artworks, is available for free and unrestricted use.

In February 2017, The Met introduced its Open Access Initiative, which makes images of public-domain artworks and basic data on all accessioned works in its collection available for unrestricted use under Creative Commons Zero (CC0). Anyone can download, share, and remix images and data about artworks in The Met collection. It is also an important statement about The Met's commitment to increasing access to the collection in a digital age

Explore the collection of the J. Paul Getty Museum at the Getty Center and the Getty Villa.
The Open Content Program makes high-resolution images of public domain artwork from the Getty collections freely available, without restrictions, to advance the research, teaching, and practice of art and art history.

The initiative also aims to support and promote the open-access movement among museums and cultural heritage institutions in removing barriers to the use of cultural heritage images.