Free and Open Source Software

Looking to start budgeting, I'd like to be able to use it on both android and linux and use syncthing to sync the file. Is there a good solution for that?

it'd be nice if I could easily divide my income into different buckets, add expenses to those buckets, and see how much is remaining in any given bucket for the current month. Less important but still nice would be an easy way to roll surplus into the same bucket for the next month