Pronunciation Power focuses specifically on pronunciation of American English and is ideal for language labs and self-learners with either a PC or Macintosh multimedia computer. It teaches all 52 American English sounds and even includes QuickTime videos of both forward and lateral views of proper mouth position.
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.