MacJPerl - A version of Perl for the Macintosh which can use Japanese characters and has a Japanese or English user interface. - http://habilis.net/macjperl/
EB Library - A UNIX C library for accessing EB, EBG, EBXA, EBXA-C, and EPWING electronic books. These formats are popular in Japan. - http://www.sra.co.jp/people/m-kasahr/eb/
Perl, MacPerl and MacJPerl - An article on using MacPerl and its Japanized version MacJPerl. - http://www.macperl.com/depts/articles/P_MP_MJP.html
Multilingualized Squeak - Support for Western European languages (Latin-1) and Japanese (JIS X0208) in Squeak Smalltalk. - http://www.is.titech.ac.jp/~ohshima/squeak/squeak-multilingual-e.html
Tcl/Tk 8.0 Japanization Patch - This is a patch to support Japanese character encodings (jis, sjis, euc-jp), fonts, kanji string handling and input methods (kinput and xim) in Tcl/Tk 8.0 for Unix and Windows. - http://www.sra.co.jp/people/m-hirano/tcltk/
Jcode - Japanese Charset Handler - Jcode.pm is a Perl module that handles various Japanese charsets including Unicode (UCS2 and UTF8) and mime headers. - http://openlab.ring.gr.jp/Jcode/