Carl Anderson pulls together a nice list of links to quality textbooks online regarding information retrieval and machine learning
I’ve been impressed in recent months by the number and quality of free datascience/machine learning books available online. I don’t mean free as in some guy paid for a PDF version of an O’Reilly book and then posted it online for others to use/steal, but I mean genuine published books with a free online version sanctioned by the publisher. That is, “the publisher has graciously agreed to allow a full, free version of my book to be available on this site.”
Here are a few in my collection:
Of course, be sure to help the authors out by picking up a dead trees version or two. Donate to some school in the developing world, or even the developed world, if you don’t really need the paper.