Japanese GitHub Repositories (2026) · Open Source Tools

A browser extension for easy on-device translation with a local LLM (PLaMo). Private, free, no server needed.

ML-powered manga translator, written in Rust.

Japanese Input Method System for Linux, macOS, Neural Kana-Kanji Conversion Engine

Aesthetic, minimalist platform for learning Japanese inspired by Duolingo and Monkeytype, built with Next.js and sponsored by Vercel. Beginner-friendly with plenty of good first issues - all contributions are welcome!

Hoshi Reader Android: Japanese EPUB reader with Yomitan lookup, Anki mining, audiobook read-along, and e-ink support.

Kana-Kanji Conversion Module written in Swift, supporting Neural Kana-Kanji Conversion and other cool features.

Japanese language library for converting Japanese sentence to Hiragana, Katakana or Romaji with furigana and okurigana modes supported.

Japanese EPUB reader for iOS

Input method for macOS and Windows: type on QWERTY, Araso picks English, Korean or Japanese per word

Multilingual neural TTS (6 languages: JA/EN/ZH/ES/FR/PT, code supports SV) — C++, C#, Rust, Go, Python, npm (WASM). VITS + Prosody, streaming, CUDA/CoreML/DirectML. pip install piper-plus | npm install piper-plus | cargo install piper-plus-cli

🎤 vibrato: Viterbi-based accelerated tokenizer

azooKey is an open-source Japanese keyboard for iPhone and iPad, written in Swift and powered by its own kana-kanji conversion engine. It provides live conversion, flexible key layouts, and a clean SwiftUI interface for a smooth typing experience.

A free, open-source platform for Japanese immersion learners. Jiten offers detailed statistics for thousands of Japanese media such as character count and difficulty, pre-built anki decks, vocabulary lists, frequency lists, user coverage, and more.

An immersion toolkit for learning Languages through games and other visual media.

JL is a program for looking up Japanese words and expressions.

JMdict, JMnedict, Kanjidic, KRADFILE/RADKFILE in JSON format

Mihon immersion fork with native dictionary lookup (Yomitan), Mokuro manga and anime support, Novel EPUB reader, and instant Anki card mining.

Make CommonMark more friendly for Japanese/Chinese/Korean (CommonMark next specification draft)—plugins & patched packages

Committed to building the world’s most cutting-edge, CJK-first memory module for all mainstream agents. Any issues and PRs are welcome.

Evidence-aware Japanese speech visualization: pitch and intonation, waveform inspection, and experimental alignment.