progrider.org/files/books/

What else do you think should be added to this?

http://www.ebook3000.com/Computer-Graphics--Principles-and-Practice--3rd-edition_211528.html

huge book on graphics algorithms. Although 3rd edition is worse, than previous, because it is geared towards video games, OpenGL and other GPU crap, instead of good old do it yourself algorithms and offline raytracing.