Aard Dictionary is a free, fast, easy to use word lookup program that looks up words fast even with huge dictionaries like English Wikipedia; looks up words in multiple dictionaries in multiple languages without switching; works great as offline Wikipedia reader; is keyboard navigation friendly; has efficient, highly compressed dictionary data storage format with ability to verify data integrity built-in.
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.
