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Anki Learning A free, open-source flashcard program that schedules reviews with spaced repetition. Nonprofit Login Optional Mobile App recommended 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 HackerRank Learning A practice platform for coding challenges, skill certifications, and interview prep. Company Login Required Mobile Supported Quizlet Learning A flashcard and study tool for memorising terms, definitions, and facts. Company Login Optional Mobile App recommended Wolfram|Alpha Learning A computational engine that answers math, science and data questions directly. Company Login Optional Mobile Supported CS50 Learning Harvard's introductory computer science course materials, available online. Nonprofit Login Optional Mobile Supported

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