OER Commons
Collection of over 50,000 high-quality OER including full courses, interactive mini-lessons and simulations, and Open Textbooks
OpenStax CNX Library
OpenStax publishes high-quality, peer-reviewed, openly licensed textbooks that are absolutely free online and low cost in print.
Skills Commons
Collection of workforce-related Open Educational Resources (OER) created by over 700 community colleges funded by a TAACCCT grant.