Online, super-hero themed science games for elementary and middle school levels. You can play for free (with ads and limited content) or pay a reasonable subscription fee for membership. (Unfortunately, you have to be affiliated with a public school to get all of the features for free! Perhaps some contact from the homeschool community would change the company policy!)
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.