Common Sense Media
This site has extensive resources and advice for parents on how to make good choices for their children regarding the consumption of digital media.
Wide Open School
This site contains loads of resources and materials for parents and students to use at home. High quality, trust-worthy, educator-approved. If you're seeking additional learning resources, this is a great place to start.
This well-known, not-for-profit foundation has exceptional instructional videos, tests, quizzes, etc. Students can drill deeper into almost any academic subject, free of charge.