Kiddom is a combination planning system and content library. A free teacher account lets you set up unlimited classes and students. You can add assignments from the library of online content from sites such as Khan Academy, TedEd, cK-12 and more. You can also add assignments from other resources or curriculum. Standards (from an extensive provided list, or your own custom-made) can be attached to assignments for tracking progress. A flexible grading system includes an easy rubric tool. This could be an extremely useful tool for both planning and assessing your child's learning.
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.