History and Social Studies curriculum available for free from a non-profit, bipartisan organization. There are currently courses in American History, Government, and Economics, with World History in the works. Courses include e-books with embedded audio and video, plus course files (for planning and assessment) that can be used with a learning management system, Google Classroom, or downloaded for offline use. Looks like a great option for high school level students.
Saturday Grab Bag
Printable curriculum materials for preschool through second grade levels.
Thursday History/Social Studies
This website from the Government Publishing Office has resources for learning about the US govern
The name of this site says it all!
Tuesday Language Arts
This company provides programs for beginning reading and math learning.
This company publishes three books for helping elementary learners explore science.
Self-paced, online courses for learning coding.