Simple Kana to Kanji Conversion Program (SKK)
A Japanese input method for Emacs. Introduction to Japanese Input Systems
An introduction to Kana-kanji input systems. KanjiPad
A Unix program which does Japanese handwriting recognition. It uses the GTK toolkit for a GUI and Todd David Rudicks's algorithms from JavaDict for kanji recognition. Japanese Notepad
Japanese editor for those who use Microsoft Windows Simplified Chinese Edition, and want to input Japanese characters including kana and kanji.