Van Dale Dictionaries is a collection of dictionaries that will help you translate from/into Dutch. The supported languages are English, French, German, and Spanish. All of the headwords within one letter are available for free. This way, you can get a detailed grasp of the depth and the possibilities of each dictionary. Furthermore, each month one full dictionary will be available for free.
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.
