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!
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.