Who would write a book and then give it away for free? Turns out, a lot of people would, and it’s part of a movement that’s having a growing impact at Oklahoma State University. Open Educational Resources, or OER, are research and classroom materials that are free for students to use. OER can include library resources, online articles and videos or open textbooks, which are published with a license that makes them free to use, distribute or adapt. The library is the heart of the open movement on campus.