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.