JWPce - JWPce is a free Japanese <--> English dictionary and word processor created by Glenn...
Jisho - Powerful and easy-to-use online Japanese-English dictionary with words, kanji and example...
Obenkyo - Obenkyo is an app to help you learn Japanese on the Android Market
RomajiDesu - RomajiDesu is a free online bi-directional Japanese-English dictionary, Kanji dictionary, Sentence analyzer and Japanese to Romaji/English translator, and Romaji to Hiragana/Katakana Converters for Japanese learners.
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.
JDICT - JDICT is a cost-effective application that provides you an opportunity to convert the Japanese text into English, making you easily communicate with your friends without any disturbance.