Khan Academy, modeled after computer gaming, uses YouTube videos to cover a wide range of subjects, including math, science, computer programming, history, art history, economics, and more.
MyOpenMath is an online course management and assessment system for mathematics and other quantitative fields, focusing on providing rich algorithmically generated assessment to support the use of free, open textbooks like the ones listed on OpenTextBookStore.com. MyOpenMath is a collaborative community of users.
Course covers reading and writing, mathematics, science, and social studies. Written at a 6-8 level for students who are not quite ready for the GED level.
Sophia's Foundations of College Algebra course builds foundational algebraic and problem solving skills needed to succeed in college-level algebra courses.
The Great Courses includes a series of high school and college level audio and video courses produced and distributed by The Teaching Company. They are designed to expand learners' horizons, deepen understanding, and foster epiphanies.