The education section of the British National Archives has a nice collection of classroom resources. There are lessons with primary sources from the archives and discussion questions, sets of lessons around various themes, and a few online games. You can search the collection by age level or historical time period.
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.