A site put together by a (now retired) homeschooling mom. There are tons of great printables here: from planning forms to handwriting paper. There are some resources connected to specific curriculum (mostly programs with a Christian world view.) There's also a subscription site with no ads and some extra features.
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.