Open Educational Resources (Textbooks)
Libretexts: Free the Textbookthis is "an easy-to-use online platform for the construction, customization, and dissemination of open educational resources (OER)..."
OASISTextbooks, courses, videos, and more are listed here in an easily searchable page.
CUNY Geneseo
Discovering the Art of MathematicsThese Texts have a traditional copyright but are free to use for educational purposes with registration.
OER CommonsCreated by ISKME, the Institute for the Study of Knowledge Management in Education
Here find a consolidation of OER materials of all types as well as growing resources to support Open Education Practice.
