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.
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.
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.