OpenStax Free Peer-Reviewed Textbooks
Free textbooks. That’s what you’ll find at Rice University’s OpenStax online library. And not illegal, pirated digital copies… legit ones. These are peer-reviewed, openly licensed college and high school textbooks.
Different subject categories, too. Math, Science, Social Sciences, Humanities, and Business, essentially.
Nothing much beyond introductory/freshman-level stuff, but obviously invaluable, adaptable content nonetheless.