Evaluating open educational resources (OER) for adoption in your course is very similar to assessing traditionally licensed materials, but some key differences:
Price is not a concern
Ability to edit and update
Ability to Integrate student content
Not as slick and shiny as commercial options
Most OER are not going to be able to compete with their commercial counterparts when it comes to glossy pages, elegant formatting, and well known authors. We can forget that such characteristics are not indicative of a textbook's pedagogical effectiveness, and that they are partially to blame for their high prices. If the scope and quality of the OER's content seems to suit your course, and its explanations, examples, and exercises effectively support your learning goals, consider giving that OER a serious evaluation.
The following checklists and rubrics can assist you in your evaluation and ensure you do not overlook a factor related to the "open" nature of the works.
Areas covered include Flexibility, Cost, Cultural Relevance, Accessibility, Data & Privacy, Integration with Campus Technology, and Customer Support. "One of the most important questions reflected in this checklist is whether the materials are flexible enough to accommodate student choices about how to acquire and interact with course material."
OpenOregon Educational Resources (https://openoregon.org/)
"This list of criteria is suitable for any type of OER, including an open textbook or individual OER artifacts/objects. This guide is intended for individual faculty or those supporting them. Not all criteria will apply in every case, but the criteria can serve as a general framework for the evaluation and selection process. Depending on the subject or course material you already have, or what you are seeking, one or more of these criteria may be more important or have greater priority."