http://blog.stcloudstate.edu/oer/2021/01/14/rob-theriault-xr-presentation-on-oer/

“The alternatives don’t have to be free, but they should be relevant, specific and if they’re cheap or free, great!
FER or free education resources is not “a thing”, at least not in any official way. But tongue-in-cheek aside, there is great value in sharing teacher notes and curating links to articles and other resources for students – either as required or supplemental reading.”

Rob Theriault

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more on Rob Theriault and XR in this IMS blog
https://blog.stcloudstate.edu/ims?s=Rob+Theriault