Kanji Go is a Mac OS X application designed to make it easy to lookup and review Japanese and Chinese.

• Look up words from and to Japanese and Chinese, English, Russian, German, and French
• Find Kanji by Radical, Reading, Meaning, Stroke Count, or SKIP index
• Create, print, import/export, and publish custom vocabulary lists
• Study using customizable digital flash cards - via traditional or Spaced-Interval methods
• Quiz Mode with adjustable difficulty and styles
• View conjugations for all Japanese verbs and adjectives
• Use Romaji, Kanji, and/or Kana when viewing flash cards and search results

You can learn more via the Online Manual and forum.