https://www.tribler.org/, which is developed by a not-for-profit research group supported by EU and Dutch research funding, does distributed torrent search without any central server. It's been around for almost a decade now.
Careful, all Tribler users are effectively exit nodes in Tor terminology. Other users' downloads will appear to come from your IP as your machine participates in the proxy network. This is spelled out exactly nowhere on their site, which I think is brazenly irresponsible.
Incorrect.
You need to check the box in settings called 'become exit node'.
Thnx for mentioning us btw! With 13 years running and our bandwidth token for Bittorrent (no ICO) it seems we're the only team left doing innovations. All other p2p teams seem to have died in the p2p winter.