Some open access scholarly publishers operate under questionable practices - for example with minimal or no peer review, charging fees after accepting papers, using editor's names without permission. 
1. Predatory open access publishing (2017). Retrieved from https://en.wikipedia.org/w/index.php?title=Predatory_open_access_publishing&oldid=760792711 )
Look for a license, often Creative Commons or GNU, this will give the details on how content can be used, shared, and adapted as well as stating an requirements (such as attribution or non-commercial use). Some material may have instructor content that cannot be shared with students.
See our Databases page, those marked with a are accessible to the public and many of them are open access or some of the content is.
Text a derivative of “How Libraries can Help”, in CCCOER: Faculty and Librarians Selecting High Quality OER, by Tina Ulrich, licensed under CC BY 4.0.