Crowdin - Localize your product in a seamless way
zkanji - zkanji is a free and open-source study tool and dictionary of the Japanese language.
POEditor - The translation and localization management platform that's easy to use *and* affordable!
Jisho - Powerful and easy-to-use online Japanese-English dictionary with words, kanji and example...
Lokalise - Localization tool for software developers. Web-based collaborative multi-platform editor, API/CLI, numerous plugins, iOS and Android SDK.
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.