This is a wonderful resource for encouraging your children's curiosity. It is a huge collection of interesting video clips that are "not-made-for-kids, but perfect for them." Search for something specific, or just browse the topics and enjoy! All for free!
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.