FreePWING generates book data of JIS X 4081 format.  Almost part of
the software is written in Perl 5 (perl 5.005 or later is required).
Since JIS X 4081 is subset of EPWING V1, EPWING viewer applications
can also read JIS X 4081 book data generated by FreePWING.

WWW: http://www.sra.co.jp/people/m-kasahr/freepwing/