Top 4 jyutping open source projects

Cantonese Jyutping Keyboard for iOS. 粵語粵拼輸入法鍵盤

粵語拼音自動標註工具 Cantonese Pronunciation Automatic Labeling Tool

A browser extension that adds Cantonese pronunciation (Jyutping) on Chinese characters

A free, open-source, offline Cantonese Dictionary for Windows, Mac, and Linux. Qt, SQLite. C++ and Python.