Open source
Open source projects that I have created. Feel free to contribute!

pinyin-to-bopomofo
pinyin-to-bopomofo offers a lightweight way to translate between pinyin (commonly used in mainland China) and bopomofo/zhuyin (commonly used in Taiwan).

simple-ts-fsrs
A minimal implementation of the FSRS (Free Spaced Repetition Scheduler) algorithm written in TypeScript.