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Brilliant Learning Interactive courses that teach math, science, and computer science through hands-on problem solving. Company Login Required Mobile App recommended MIT OpenCourseWare Learning Free lecture notes, exams and videos from MIT courses. Nonprofit Login Not required Mobile Supported Khan Academy Learning Free lessons from math to science Nonprofit Login Optional Mobile Supported OpenStax Learning Free, peer-reviewed textbooks for introductory college and AP-level subjects from a nonprofit at Rice University. Nonprofit Login Not required Mobile Supported Project Euler Learning A long-running archive of mathematical problems meant to be solved with code. Nonprofit Login Optional Mobile Supported Wolfram|Alpha Learning A computational engine that answers math, science and data questions directly. Company Login Optional Mobile Supported Desmos Learning A free online graphing calculator and math tools. Company Login Optional Mobile App recommended