Metropolitan Museum of Art's collection of nearly 400 free art history books. Now the Getty Museum has put more than 250 art books online for anyone to read online and or download. You can find all of these books in the Getty Publications Virtual Library. You can search through the collection by author, keyword, or title. Alternatively, you can simply browse the collections. All of the free books are also available on Google Books. In fact, I've used Google Books to embed one of the books below.
Applications for Education
The Getty Publications Virtual Library could be a great resource for art teachers and their students. Students who are researching artists and or art movements could consult the collection to find reference materials.
H/T to Open Culture.