Declan's Japanese Language Software - [Win] Commercial software that teaches kanji, hiragana, and katakana. Also available are audio flashcards software and an English-Japanese dictionary. - http://www.declan-software.com/japanese
WaKan - Dictionary, Editor and Vocabulary - Freeware tool for Japanese and Chinese language learners for Windows. Includes character dictionary, word dictionary, editor with kanji conversion, printing (kanji cards, vocabulary, text with furigana), and vocabulary manager. - http://wakan.manga.cz/
KanjiQuick - A kanji dictionary software for Windows giving including 6500 Japanese characters and 47.000 compounds. Supports handwriting and animated stroke order display. - http://www.japanese.de/KanjiQuick_e.html
Drill The Kanji - An on-line Java flashcard program for studying and testing on kanji, including reading (on-yomi, kun-yomi) and meaning tests. - http://www.asahi-net.or.jp/~ik2r-myr/kanji/kanji1a.htm
gjiten - [Unix] A Japanese dictionary for Linux/Gtk, including Japanese to English, English to Japanese and Kanji. - http://gjiten.sourceforge.net/index.ja.php
MOJI - A Japanese dictionary integrated to the Mozilla Firebird browser. Provides translations into English, French or German and includes a Kanji dictionary. - http://moji.mozdev.org
jBrowse - Japanese Translation IE Plugin - [Win] A free plugin for Internet Explorer that injects furigana (phonetic hints) and word definitions in English into Japanese web pages. - http://www.jbrowse.com/products/jbrowse
KanaSensei - Small java applet that facilitates learning of Japanese. - http://kanasensei.sourceforge.net
LexiKAN - Maker of flashcard software for learning to write and read Japanese Kanji and Kana. - http://www.lexikan.com
Kanji Gold - [Win] Japanese kanji program. - http://web.uvic.ca/kanji-gold/
Kana Sensei - [Win/MS-DOS] Japanese Language teaching software for beginners. - http://www.chachich.com/mdchachi/ksensei.html
The Monash Nihongo ftp Archive - A list of lots of Japanese educational software - includes JWP, a freeware Japanese word processor. - ftp://ftp.cc.monash.edu.au/pub/nihongo/00INDEX.html
Kanji Trainer Penpen - [Win] A freeware Japanese kanji and/or Chinese hanzi study game, similar to Tetris. - http://www.coolest.com/penpen/
Gakusoft - [Win]Maker of KingKanji, a shareware Japanese / Kanji flashcard program. - http://www.gakusoft.com
QuickScholar.com - [Win] Software to help you learn Japanese, focusing on hiragana, katakana and kanji. - http://www.quickscholar.com/
JquickTrans - [Win] Software for learning Japanese and using it on their PCs. - http://www.coolest.com/jquicktrans/