Several of the OER course collections on Net Texts.

Net Texts has launched their free “OER Textbook Replacement Courses” collection for Science, Social Studies, Math, and English.

Each of the “40 ready-to-use courses…can act as a complete textbook replacement or as a framework that teachers can supplement with their own curriculum materials” and is ideal for “1:1 computing programs, blended learning environments, flipped classrooms, and traditional classrooms looking to infuse more technology into core content areas,” according to the press release.

A number of the course materials draw from the Saylor Foundation’s growing K-12 courseware initiative as well as from Saylor University courses.

Further reading:
Net Texts Launches Free OER Textbook Replacements (THEJournal)
Net Texts Makes It Easy to Replace Textbooks with New Open Educational Resources Courses (Net Texts press release)