openstaxcollege.org

x0Mb TIL Bill and Melinda Gates made a site that provides free textbooks for college students 100% legally
DVZj TIL Bill and Melinda Gates funded a website created by Rice University that provides free open-source textbooks for college students
AKd7 TIL that there is a non-profit organization that provides free course books. Free, not pirated. The organization is funded by the likes of Bill and Melinda Gates foundation, Rice University and the Hewlett Foundation and aims at making higher education available to more people.