upmendex is a multilingual index processor with following features:

 * Mostly compatible with makeindex and upper compatible with mendex,
   based on mendex version 2.6f by ASCII media works.
 * Unicode for internal process and support UTF-8 encoding for
   input/output.  Will work with upLaTeX, XeLaTeX and luaLaTeX.
 * Support Latin (including non-English), Greek, Cyrillic, Korean
   Hangul and Han (Hanzi ideographs) scripts
 * Apply International Components for Unicode (ICU)[4] for sorting
   process.