wanakana
Utility library for converting between Kanji, Hiragana, Katakana, and Romaji
hepburn
Convert Japanese Hiragana and Katakana script to, and from, Romaji using Hepburn romanisation
jaconv
Japanese character conversion library
kuroshiro
kuroshiro is a Japanese language library for converting Japanese sentence to Hiragana, Katakana or Romaji with furigana and okurigana modes supported.