OASIS OER Search Tool searches more than 155,000 records from 52 sources selected by SUNY OER Services. Use this search, or the GMU OER Metafinder, to help search for OER.
Open Textbook Library: a collection of open textbooks from various disciplines. Books must meet certain requirements to be included in the library.
OER Commons - "Find Free-to-Use Teaching and Learning Content from around the World. Organize K-12 Lessons, College Courses, and more."
MERLOT: "access to curated online learning and support materials and content creation tools, led by an international community of educators, learners and researchers."