AULEX
A website with a lot of Spanish translation dictionaries, with a particular emphasis on Native American languages.
BitEx日中・中日辞典
Online resource website for Japanese speakers learning Chinese.
Cambridge Dictionaries Online
A dictionary of English by the Cambridge University Press.
Chinese-Tools.com
Many, many online dictionaries based in Chinese.
Denshi Jisho
An English - Japanese online dictionary based on Jim Breen's WWWJDIC with more portable options.
Diccionarios.com
Mostly Spanish-based online dictionaries.
Dict.cn
A very useful Chinese - English dictionary.
Dictionary.com
A basic and easy-to-use English dictionary.
Dr.eye
A pretty basic English - Chinese dictionary.
elmundo.es diccionarios
A Spanish, Spanish-English, and Spanish-French dictionary maintained by El Mundo.
excite辞書
Japanese, Japanese-English, and Japanese-Chinese dictionaries powered by excite.
GoiHata Japanese Spanish Dictionary
A basic and easy-to-use Japanese - Spanish dictionary.
Goo辞書
Goo's Japanese-English dictionary, with a lot of other specialized dictionaries for Japanese-speakers.
iCIBA
A Chinese to English dictionary with very detailed entries.
JGram
A user-generated searchable Japanese grammar database.
Jiaoyubu Chongbian Guoyu Cidian Xiudingben
The Taiwanese Ministry of Education's online traditional Chinese resource.
Jim Breen’s WWWJDIC
A really really really good English - Japanese online dictionary.
JP日语学习网
A website in Chinese for tools and resources to learn Japanese.
Kanjibukuro
A kanji lookup tool that displays characters in Japanese, traditional Chinese, and simplified Chinese.
Linguee
A tool for seaching words and expressions in English and German.
LingvoSoft Online Dictionaries
Largest collection of free language to language online dictionaries
Mandarintools Chinese-English Dictionary
A website with Chinese learning resources, including a Chinese-English dictionary.
Merriam-Webster OnLine
Merriam-Webster's online dictionary for American English.
nciku
A very powerful and versatile Chinese - English dictionary.
Nihongo Zokugo Jisho
A Japanese dictionary of colloquialisms and slang.
Online Life Science Dictionary
An English to Japanese online life science dictionary
POPjisyo
An online dictionary that can also be used to add pop-up hints to websites in a foreign language.
Real Academia Española
The Spanish language dictionary of the Royal Spanish Academy.
Rikaichan
A Japanese to English/French/German/Russian browser dictionary tool.
RY楽訳中国語辞書
A useful website for Japanese speakers learning Chinese.
Sanseido Web Dictionary
An online Japanese dictionary by Sanseido.
SPACE ALC
An English - Japanese online dictionary for Japanese speakers.
SpanishDict
Among other things, an English - Spanish dictionary.
Tonko Jikai Chinese-Japanese Dictionary
A Chinese - Japanese dictionary with almost 30,000 words.
Urban Dictionary
A dictionary of English slang and popular phrases written by users.
Wordnik
A dictionary for all words -- not just the commonly-used or well-known ones.
WordReference
A collection of English translation dictionaries.
Yamasa Online Kanji Dictionary
An English-Japanese dictionary with useful search features and stroke order.
Zhongwen.com
A basic dictionary in English for traditional Chinese.