Large in of systems internet a, specialty, whether and.
Nor will Moneydance or Gnu Cash give you the full solution you are looking for.
I imaging people don't write a well-known, open-source, tool that will do this for fear of the negative uses it could have, and the resulting liability.
I currently use financeworks.to keep track of transactions/balances in my bank, brokerage, and credit card accounts.
My favorite feature: it automatically pulls transactions/balances without my having to log in to each separately.