This special issue explores the affordances and challenges of OER, both in their in-class use and in the initiatives at various scales to encourage instructors, librarians, and other education workers to adopt them and explore their full potential for transforming pedagogy. We are especially proud to publish this OER special issue on CUNY’s Manifold instance. Manifold, developed by the CUNY Graduate Center in partnership with The University of Minnesota Press and the development firm Cast Iron Coding, represents a new approach to OER publishing that we believe JITP’s audience will appreciate. With this issue, and with the publication of our archives in early 2023, you can collect articles to share and annotate with your students and colleagues.