This blog comes from two public elementary teachers. It's full of free resources for math and language arts learning. You can download pdf's and powerpoint files including games, learning centers, worksheets and more. It may take a bit of searching if you're looking for something specific, and I found the amount of ads pretty distracting. But there are hundreds of quality, free resources here.
A discovery-based elementary math program.
A digital library featuring literacy, assessment, and tracking tools.
This site has a collection of over 500 science lesson plans for grades 5 through 12.
History and Social Studies curriculum available for free from a non-profit, bipartisan organizati
Online, interactive program for learning music reading and theory.
This non-profit organization offers over 100 free self-paced, online, college level courses.