Company SuperMemo World created these great apps:
SuperMemo (old), SuperMemo Chinese: Fast Track for Beginners, SuperMemo Polish. Bez problemu!, SuperMemo Spanish. ¡No hay problema!, SuperMemo Angielski. No problem!, SuperMemo Englisch. No Problem!, Czytnik kodów Español Extremo A1-B1, Czytnik kodów Extreme English A1-B1, Czytnik kodów Extremes Deutsch A1-B1, Szwedzki - Szybki start, Norweski - Szybki start, Niderlandzki - Szybki start, Duński - Szybki start, My First English Words, part 1, SMARTfiszki: angielski, SMARTfiszki niemiecki, SMARTfiszki: hiszpański, SMARTfiszki: francuski, My First German Words, part 1, My First Spanish Words, part 1, My First Polish Words, part 1, SMARTfiszki: CAE, SMARTfiszki: FCE, SMARTfiszki: Grammar, My First French Words, part 1, My First Russian Words, part 1, My First English Words, part 2, My First Spanish Words, part 2, My First German Words, part 2, My First French Words, part 2, My First Polish Words, part 2, My First Russian Words, part 2, OK! English: Skanuj i słuchaj, OK! Deutsch: Skanuj i słuchaj, OK! Español: Skanuj i słuchaj, OK! Français: Skanuj i słuchaj, Memo The Dragon 1, Memo The Dragon 2, Olive Green SuperMemo, SuperMemo – effective learning, and others..
