Both links via Open Culture:
- Getty Publications' Virtual Library. From the introductory blog post: "The books in the Virtual Library come from three of the Getty’s programs: the Getty Conservation Institute, the Getty Research Institute, and the J. Paul Getty Museum. The over 250 offered here today—and the many more we will continue to add into the future—represent a significant portion of our publishing list. Still, they are just a modest part of what is becoming an important, informally networked library, spread across multiple institutions and spanning thousands of years of art historical knowledge."
- Wellcome Images. From the introductory blog post: "The [over 100,000] images can be downloaded in high-resolution directly from the Wellcome Images website for users to freely copy, distribute, edit, manipulate, and build upon as you wish, for personal or commercial use. The images range from ancient medical manuscripts to etchings by artists such as Vincent Van Gogh and Francisco Goya."