I'm only aware of one open-source public transport lookup app, which is Öffi https://oeffi.schildbach.de/index.html

It doesn't have data for Taiwan, unfortunately. Are there any that do?

Aside: Audrey Tang is also on HN, though not active much lately: https://news.ycombinator.com/user?id=audreyt It sometimes strikes me as surreal that powerful people actually hang out on the same websites as people like you and me.