Online math software from Amazon. Includes lessons for K through 12. You can access one grade level and many features for free. Pricing appears to be pretty reasonable for the premium service, which includes assessments and other features.
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.