1.Common wealthof Learning (COL):
URL: https://colcommons.org/
2.British Columbia Open Text Book Project:
URL: https://collection.bccampus.ca/
3.Rice University Open Stax: URL: https://openstax.org/
4.e-Campus Ontario: URL:
https://www.ecampusontario.ca/
5.Skills Commons: URL: https://www.skillscommons.org/
6.Libre Texts: URL: https://libretexts.org/
7.Saylor Academy:URL: https://www.saylor.org/