Google topic and add "OER" or "open educational resource" as search terms
Search OER repositories directly:
Open educational resources (OER) are educational materials that are freely accessible and available at no cost. Traditionally, textbooks are often very costly because due to the strict copyright that publishers impose. OER are freely available under Creative Commons Licenses, an alternative to traditional copyright.
Source: https://wiki.creativecommons.org/wiki/What_is_OER%3F
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