Do you have an idea? Whether AlternativeTo nor OpenSourceAlternativeTo got an answer.
EDIT: I should have had added, that I was not looking for the financial aspects of the app, but I was looking for a possibility to store tickets and cards: Catima offers at least somewhat, what I was looking for.
Are you in Europe? Then OpenBank
That seems to me to be a bank and not an alternative to Apple/Google Pay, let alone open source. Or am I wrong?
It’s not opensource, but they have “OpenPay” which allows you to pay with your smartphone without using Google or Apple pay, which I think is the question, no?
We might have to wait until the head death of the universe for an opensource bank, I think.