[nromiun]

https://www.passwordstore.org

Here is a popular CLI app to manage passwords. I use it on my desktop, laptop and phone.

[terseus]

You don't need Termux for that, there are native clients for Android, I use this one: https://play.google.com/store/apps/details?id=dev.msfjarvis....

[nromiun]

There are native clients, but can you use git to sync the encrypted passwords with your other devices?

And that was just one example. You can also use python as a much better calculator, share files over wifi with a web server etc.