tiny-segmenter
Super compact Japanese tokenizer in Javascript. http://chasen.org/~taku/software/TinySegmenter/
kuroshiro
kuroshiro is a Japanese language library for converting Japanese sentence to Hiragana, Katakana or Romaji with furigana and okurigana modes supported.
headless-react-datepicker
A headless, highly customizable, multi-calendar date picker component for React. It supports various calendars and locales.