Well documented advantages of OER for students include:
5.2 OER, Open Textbooks, and Open Courses by Creative Commons. CC BY 4.0
Open Access materials offer a wide range of benefits for students:
The academic, economic, and societal impacts of Open Access: An evidence- based review. By Tennent, Waldner, Jacques, Masuzzo, Collister, & Hartgerink. CC BY 4.0
Faculty benefits from OER creation, adoption, and usage:
5.3 Finding, Evaluating, and Adapting Resources by Creative Commons. CC BY 4.0
Faculty benefits from using Open Access resources and community:
5.1 Open Access to Scholarship by Creative Commons. CC BY 4.0
A montage of the of the logs of Wikipedia and the Open Access Movement by Pete Forsyth CC BY 3.0