Menu Bar Translator lets you translate text over in 80 languages. You just need to paste your text into text view inside the app, hit Enter, and the text will be instantly translated into the selected language. You can resize the pop-up window if you want more room. You can swap your target languages by pressing the arrow button.
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.
