This simple Mac app scans entered Japanese text and highlights its Chinese characters (kanji) according to the school year in which they are taught in Japan. This tells you at a glance if your Japanese text can be easily read by a given audience. The official list of which characters are taught in which year of elementary school is published by the Ministry of Education of Japan.
InstantTranslate makes it really easy to translate a selection of text in the application you are working in from one language to another language.
One World Dictionary by Ascendo is a leading multilingual reference tool for Apple desktops.
