What's the best free, simple tool for tracking my money?
I've looked into YNAB but that not free. I just want to track basic spending, income, and overall net worth.
I don't know if it's "the best", but Every Dollar from Dave Ramsey is pretty good. Don't know if it will track overall net worth, though.
Have a look at Pro Expense which can be downloaded from the F-Droid store.
Gnucash would be an good idea if you want to use the double entry system.