JWPce - JWPce is a free Japanese <--> English dictionary and word processor created by Glenn...
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.
Obenkyo - Obenkyo is an app to help you learn Japanese on the Android Market
Bialect - Learn languages faster with stories.
zkanji - zkanji is a free and open-source study tool and dictionary of the Japanese language.
Clozemaster - Learn a language through mass exposure to useful vocabulary in context.