TV5 Monde Alexandria
TV5MONDE presents its brand-new English-Norwegian free dictionary. This on-line multilingual electronic tool operates as a terminological database, enabling users to search for the translation and definition of a word to and from 22 different languages, including Norwegian.
http://www.tv5.org/TV5Site/alexandria/definition.php

Freedict
Freedict English-Norwegian dictionary provides instant translation of English words and phrases up to 49 characters long. It includes links to other sites of interest about Norway as well as freedict.com online translators for other languages.
http://www.freedict.com/onldict/nor.html

Logos
Logos bills itself as the largest freely accessible multilingual dictionary on the web, with dictionaries in 232 languages. English words and phrases can be translated into Norwegian, and vice-versa, at the touch of a button. Logos also features a universal conjugator, children’s dictionary, and more than 43,000 online books in over 100 languages, including 85 in Norwegian.
http://www.logos.it/

Dicts
This English-Norwegian dictionary translates words from both languages instantly, and allows the user to type in just part of a word to find all possible matches. The site also features a picture dictionary.
http://dicts.info/ud.php?l1=Norwegian_Bokmal&l2=

Ectaco
This site offers instant translations of English and Norwegian words. This free English-Norwegian dictionary contains 400,000 words.
http://www.ectaco.co.uk/English-Norwegian-Dictionary/