Hanzi Master ("Hanzim") is a Chinese character learning-aid program. It is designed to help you memorize characters and words by letting the structure they share work for you instead of against you. In the main window, characters with the same radical, phonetic component, or pronunciation as a character of interest are shown in the bottom three panels.
One World Dictionary by Ascendo is a leading multilingual reference tool for Apple desktops.
InstantTranslate makes it really easy to translate a selection of text in the application you are working in from one language to another language.