Every mortgage calculator I could find couldn't answer most relevant questions. Is it better to put more down or invest the money? When is buying points worth it? Do mortgages affect your taxes? Are VA fees justified? So I put together https://realratecalculator.com/ to quickly find out.
Tor and I2P do this on a very large scale. But if you're really paranoid, adversaries with extensive global surveillance might be able to track data in those kinds of systems being sent from one node and forwarded by others. So this uses scheduled & dummy or padded transmissions