Over 300 free college-level courses (ideal for ages 13 and up - I even take courses!). The courses are offered by the world's top universities, and are all online, free. Courses vary in time requirements: some courses are 4-6 weeks long, for example, and take 4-6 hours per week to complete. #homeschool
Free Educational Resource: Khan Academy
(with a Kindle Fire giveaway!) JumpCourse: Online courses to help your high school student CLEP out of college classes while getting high school credit, too!