- BCcampus Open Textbook Project: https://open.bccampus.ca/find-open-textbooks/
- Commonwealth of Learning Oasis: http://oasis.col.org/handle/11599/2402
- ICDE OER: https://www.icde.org/open-educational-resources
- MERLOT: https://www.merlot.org/merlot/index.htm
- OpenStax: https://cnx.org/
- OER Commons: https://www.oercommons.org
- Manitoba Open Textbook Initiative: http://openedmb.ca/
- eCampus Ontario: https://openlibrary.ecampusontario.ca/
- Alberta OER Repository: http://albertaoer.com/content/repository?page=1
- Open Textbook Library: http://open.umn.edu/opentextbooks/
- College Open Textbooks: http://www.collegeopentextbooks.org
- Saylor Books: http://www.saylor.org/books
- Community College Consortium for Open Educational Resources: https://www.cccoer.org/learn/find-oer/
- LibreTexts: https://math.libretexts.org/
- Mason OER Metafinder: https://oer.deepwebaccess.com/oer/desktop/en/search.html
- MIT OpenCourseWare: https://ocw.mit.edu/index.htm