zkanji - zkanji is a free and open-source study tool and dictionary of the Japanese language.
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.
Jisho - Powerful and easy-to-use online Japanese-English dictionary with words, kanji and example...
JWPce - JWPce is a free Japanese <--> English dictionary and word processor created by Glenn...
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.
Takoboto - Japanese dictionary & Japanese language learning tool.