Khan Academy

Khan Academy’s mission is to provide a free, world-class education to anyone, anywhere. It offers a learning platform with hundreds of courses in subjects such as math, science, and reading, aimed at students, teachers, and parents. Lessons are designed to be personalized so learners can fill gaps and master skills, and the nonprofit says the service is available in many countries and languages.

Khan Academy also works with schools and districts and offers tools for early learners and teachers. As a nonprofit, it relies on donations to keep core learning resources free.