MacJPerl
A version of Perl for the Macintosh which can use Japanese characters and has a Japanese or English user interface. Jcode - Japanese Charset Handler
Jcode.pm is a Perl module that handles various Japanese charsets including Unicode (UCS2 and UTF8) and mime headers. Multilingualized Squeak
Support for Western European languages (Latin-1) and Japanese (JIS X0208) in Squeak Smalltalk. Perl, MacPerl and MacJPerl
An article on using MacPerl and its Japanized version MacJPerl. 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. EB Library
A UNIX C library for accessing EB, EBG, EBXA, EBXA-C, and EPWING electronic books. These formats are popular in Japan.