Initiative from the Academic Senate for the California Community Colleges supporting the development, expansion, and use of open educational resources for California Community Colleges.
CK-12 is probably the biggest open content provider for K-12 STEM content. CK-12 provides standards-aligned teaching resources. Content is mapped to a variety of levels and standards, including common core.
The Center for Open Educational Resources & Language Learning (COERLL) is one of 16 National Foreign Language Resource Centers (LRC's) funded by the U.S. Department of Education. The overall mission of these federally-funded centers is to improve the teaching and learning of foreign languages by producing resources (materials and best practices) that can be profitably employed in a variety of settings.
Growing collection of free virtual labs, experiments, and simulations used in teaching the science, technology, engineering, and math disciplines in higher education.
Open Political Science or "OPoliSci explores open educational resources and practices for political science faculty and students." Focus mostly on books and articles.
An open access resource for faculty and librarians. It is intended to be a collaborative space for adapting and experimenting with research assignments and sharing the success or lessons learned so that others may benefit. The database contains multiple, reliable and reproducible research assignments.
The BCcampus Open Education OER by Discipline Guide lists a range of open educational resources organized by discipline. This guide is updated as new resources are identified.