This search portal will direct you to several different sites that allow you to search for items with Creative Commons licenses. Always make sure that you have the appropriate search limiters set on each site to ensure that you are in fact seeing results that have CC licenses.
"All of our textbooks are peer-reviewed and absolutely free," most of them under a Creative Commons Attribution 4.0 International License. Support comes from Rice University, the Bill & Melinda Gates Foundation, and many other partners.
A wide range of texts, many licensed under Creative Commons licenses. Free to read, download, or print; for bulk re-use rights, refer to the individual item's restrictions.
