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.

Kanji Koohii - Remember the kanji; mnemonics, smart dictionary, flashcards, spaced repetition.

Avokado - Language learning app

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.

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

WaniKani - Learn around 1,700 kanji and 5,000 vocabulary words in about a one to two years.