Open Educational Resources (OER) are any type of educational material that’s freely available for teachers and students to use, adapt, share, and reuse. Examples of OER include: full courses, course modules, syllabi, lectures, homework assignments, quizzes, lab and classroom activities, pedagogical materials, games, simulations, and many more resources contained in digital media collections from around the world. OER save money, save time, are reusable, improve access, democratize learning and make an impact!
http://guides.library.stonybrook.edu/oer/home