Kakasi - Kanji Kana Simple Inverter - A language processing filter to convert kanji characters to hiragana, katakana or alphabetic characters (romaji). It may be helpful to read Japanese documents. - http://kakasi.namazu.org/index.html.en
Juman - An extensible morphological parser for Japanese running on Windows and Unix. - http://www-nagao.kuee.kyoto-u.ac.jp/nl-resource/juman-e.html
Japanese Dictation Toolkit - Free software repository for automatic speech recognition, sponsored by IPA (Information-technology Promotion Agency), Japan. - http://winnie.kuis.kyoto-u.ac.jp/dictation/
Japan Electronic Dictionary Research Institute - The EDR Electronic Dictionary was developed for advanced processing of natural language by computers, and is composed of eleven sub-dictionaries. Sub-dictionaries include a concept dictionary, word dictionaries, and bilingual dictionaries. - http://www.iijnet.or.jp/edr/
ChaSen - A morphological parser for the Japanese language. - http://chasen.aist-nara.ac.jp/