This company provides various forms of the California Achievement Test, printed diplomas and certificates, and a very nice online portfolio system with grading options and storage of documents and images. All very affordable!
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.