More commonly known as “open educational resources” (OER), open textbooks are free for educators to use, customize to their students’ needs and backgrounds and share with others. Open textbooks are freely available from nonprofit groups like CK12, OER Commons and OpenStax, and many are peer-reviewed and vetted for quality.
https://www.nydailynews.com/opinion/ny-oped-open-textbooks-in-more-ways-than-one-20200629-xiusf76onzcy5hm7f4e6q47ape-story.html
