FarsiDic is a professional dictionary that lets you translate English into Persian, and vice versa. The program includes over 380,000 words. The application is very easy to use - all you need to do is add the word you want to translate and the result is displayed immediately.
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.
