OER CommonsOER Commons is a portal with free-to-use, openly licensed educational resources, for teachers and instructors. Materials are classified by subject area, grade level (primary, secondary, and postsecondary), and then material type. The latter include Activities and Labs, Assessments, Curriculum Standards, Homework, Lecture Notes, Lesson Plans, Syllabi, Training Materials, Video Lectures, and more.
Materials are also classified by media format (Audio, Graphics, Text/HTML, Video, etc.). Open-access textbooks are classified by Subject, Grade Level, and Collection.