dict.cc - dict.cc is not only an online dictionary translating from English and German to 21 languages.
GoldenDict - The program has the following features: Use of WebKit for an accurate articles' representation, complete with all formatting, colors, images and links.
Linguee - English Dictionary and Translation Search with 1,000,000,000 example sentences from human translators. Languages: English, German, French, Spanish, and Portuguese
Lingoes - Lingoes is an easy and intuitive dictionary and text translation software.
Wikipedia - Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation.
Google Translate - Google's free service instantly translates words, phrases, and web pages between English and over 100 other languages.