zkanji - zkanji is a free and open-source study tool and dictionary of the Japanese language.
JA Sensei - Complete suite to Learn Japanese !
Jisho - Powerful and easy-to-use online Japanese-English dictionary with words, kanji and example...
Akebi Japanese Dictionary - Offline Japanese-English kanji dictionary.
JWPce - JWPce is a free Japanese <--> English dictionary and word processor created by Glenn...
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.