Translate.Net is free client to many translating services available online (translators, monolingual and bilingual dictionaries).

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Already supported 45 sites, 57 services, 70 languages, more of 4000 translations directions, including Google translator and dictionary, Wikipedia and Wiktionary, Yahoo Babel Fish Translator, SYSTRAN translator, Merriam-Webster dictionary and thesaurus. You can check full list of supported services and languages at http://translate-net.appspot.com/services.en.html