gooDict is a simple dictionary application. It contains Japanese, English-Japanese and Japanese-English dictionaries. It must be useful for people who are studying Japanese.
It allows you to look up dictionary through "Service" function from other Cocoa application. And gooDict can automatically look up the selection of other Cocoa application at background. (Not available in Safari) It also can automatically look up the content of pasteboard. So if you find an unknown word, you just select or copy that word and gooDict shows you the meaning of that word.
gooDict uses goo as a dictionary.