zkanji - zkanji is a free and open-source study tool and dictionary of the Japanese language.
Google Translate - Google's free service instantly translates words, phrases, and web pages between English and over 100 other languages.
Localingual - Listen to the voices of the world
Lingvanex - Translation apps for business, travels, professional translators, students and free style people.
Obenkyo - Obenkyo is an app to help you learn Japanese on the Android Market
Mate Translate - Ultimate translation app for Mac, iOS, Chrome and many more