AN Anki Freemium Ankitects · Learn Ugly, free, and the best way to keep facts in your head. Open apps.ankiweb.net ↗
DU Duolingo Freemium Duolingo · Learn Streaks and short lessons. A habit, not a fluency guarantee. Open duolingo.com ↗
KA Khan Academy Free Khan Academy · Learn Clear explanations, exercises, and no tuition. Open khanacademy.org ↗