Free, online, interactive music theory lessons. Covers concepts from beginner to advanced level. There are also tools for ear training and developing fluency in music reading. You can use the material online for free, or purchase iOS apps to do your learning offline.
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.