Freedict is a collection of free (GPL-licensed) bilingual dictionaries. There are DICT versions available. Some Linux distributions (such as Debian) provide the Freedict dictionaries as easily installable packages. StarDict can make a good frontend for daily use of Freedict.
List of available dictionaries:
Afrikaans language - German language
Czech language - English language
Danish language - English
German - English
German - French language
German - Italian language
German - Dutch language
German - Portuguese language
English - German
English - French
English - Hungarian language
English - Irish language
English - Italian
English - Latin
English - Dutch language
English - Portuguese language
English - Russian language
English - Spanish language
English - Swedish language
English - Welsh language
French - German
French - English
French - Dutch
Hungarian - English
Irish - English
Italian - German
Japanese language - German
Latin - German
Latin - English
Dutch - German
Dutch - English
Dutch - French
Portuguese - German
Portuguese - English
Scottish language - German
Serbo-Croat language - English
Slovenian language - English
Spanish - English
Swahili language - English
Swedish - English
Turkish language - German
Turkish - English
= External links=
http://freedict.org/
[http://dict.tu-graz.ac.at/cgi-bin/Dict http gateway to DICT server with many freedict dictionaries]