BCcampus Open Education OER by Discipline Guide
Lists a wide range of open educational resources organized by discipline.
This guide is updated as new resources are identified.

Open Textbook Library: Social Sciences
MERLOT
This site links to varied materials including textbooks, simulations, assessment tools, tutorials, quizzes, and more. Use advanced search for more precise retrieval.

OER Commons: Social Science Collection Resources
A large OER repository with textbooks & multiple types of learning support materials.

Open Washington OER Network

Open Oregon Educational Resources

Digital Public Library of America
National Science Digital Library
NSDL offers open access materials supporting science, technology, engineering, and mathematics education.