Google Translate Desktop is a free portable desktop translator based on google translate. It can quickly translate almost any text between 58 languages, and pronounce for 34 languages of them. Also it can translate website for easily viewing.
Downloads: 74423 - Freeware - Download Now

Talking Partner Dictionary for Windows provides bidirectional word translation and synthesis of speech. Vocabulary size is 400,000 words/phrases. One of its remarkable features is the ability to pronounce words.
Downloads: 56808 - Shareware - Download Now

Lingvosoft Dictionary for Windows allows instant word translation and back translation of 400.000 words/phrases.

Downloads: 67378 - Shareware - Download Now

English-German-English machine translation
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A powerful translation tool that combines a client-end part with the power of a remote translation engine currently supporting 48 world languages. The software is intended for translating relatively small texts (up to 6000 characters).
Downloads: 43911 - Shareware - Download Now