Anki - Anki is a program which makes remembering things easy. Because it's a lot more efficient than traditional study methods, you can either greatly decrease your time spent studying, or greatly increase the amount you learn.

RemNote - All-in-One Tool For Thinking & Learning

Memrise - Learn a new language with games, humorous chatbots and over 30,000 native speaker videos.

Quizlet - Quizlet allows you to review and create flashcards for a variety of subjects, such as math and reading.

Duolingo - Duolingo is a free language learning app for iOS, Windows and Android devices. The app makes learning a new language fun by breaking learning into small lessons where you can earn points and move up through the levels. Read more about Duolingo.

WordsKeeper - Learn any language. Build and grow your own vocabulary. Keep words, phrases and notes in one place.