zkanji - zkanji is a free and open-source study tool and dictionary of the Japanese language.
GoldenDict - The program has the following features: Use of WebKit for an accurate articles' representation, complete with all formatting, colors, images and links.
Jisho - Powerful and easy-to-use online Japanese-English dictionary with words, kanji and example...
Lingoes - Lingoes is an easy and intuitive dictionary and text translation software.
JWPce - JWPce is a free Japanese <--> English dictionary and word processor created by Glenn...
Google Translate - Google's free service instantly translates words, phrases, and web pages between English and over 100 other languages.