This nice little free resource has flash animations of military history. It's limited to just a few events (the Crusades, American Revolution, Civil War, and World War II) but the animations are nicely done and informative.
This site has a library of science activities and lessons, plus links to many other websites.
These learning kits on different countries are designed to promote global citizenship.
Self-paced, online coding classes for ages 7 to 15.
This site provides group buys for homeschoolers.
This is a wonderful website from Stanford Math Education Professor Jo Boaler.
This is the organization that publishes Poetry Magazine.