Synonymous.com

A Japanese Dictionary for the Japanese Text Initiative
University of Virginia's portal for Jim Breen's Japanese-English Dictionary. (EUC)
etext.lib.virginia.edu/

Japanese Dictionary
EDICT and KANJIDIC server from Online-dictionary.biz with JavaScript romanized-kana Japanese to English and English to Japanese. (UTF-8)
www.online-dictionary.biz/

Heartful English-Japanese Dictionary
Toyohashi University of Technology’s EDICT server with English to Japanese only. (EUC)
www.ss.ics.tut.ac.jp/

Spencer's Japanese-English Dictionary
EDICT and KANJIDIC server with kana, radical-indexed kanji, or romanized Japanese to English and English to Japanese. (SJIS)
spencer.blackmarket.net/

Jonsay's English-Japanese Dictionary
Hyperlinked wordlists arranged into semantic categories. (UTF-16)
www.jonsay.co.uk/

Online English to Japanese to English Dictionary
JavaScript EDICT server from Freedict.com with romanized Japanese to English and English to romanized Japanese. (GIF)
www.freedict.com/

Onomatopoetic English-Japanese Dictionary
Glossary with English and Japanese indexes. (GIF)
www.badguy.jp/

Kanjiroushi Japanese Learner's Dictionary
EDICT and KANJIDIC server with word search in English, French, or Japanese; and kanji search by number of strokes, radical, pronunciation, or grade level. (UTF-8)
www.kanjiroushi.net/

Bidirectional English-Japanese Dictionary
Pacific Software Publishing’s EDICT server with kana or kanji Japanese to English and English to Japanese. (SJIS)
dict.pspinc.com/

jeKai Japanese-English dictionary
Tom Gally’s ongoing project to build a free, open Japanese-English dictionary with translation equivalents, illustrations, and examples. (SJIS)
www.jekai.org/