This is a free online planning system designed for classroom teachers. Some of the features are not that useful for homeschoolers, but one useful feature is integration with Google apps. And it's free, so may be worth a try!
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.