Russi is a handy English - Russian dictionary with over 200,000 definitions. The application helps you with offline pronunciation for both Russian and English languages. You can choose between American and British accent voice. You can quickly search for the desired word or phrase by using the Services menu.
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.