Você pode usar o Google em busca de proxies gratuitos, mas não consegui fazer nenhum deles funcionar. Então eu usei essa coisa chamada Sua Liberdade . Depois de se registrar, você tem acesso a sua rede de servidores proxy. Então eles fazem o download do programa Your Freedom, que conecta você ao servidor ideal.
Então você tem seu programa de torrent conectado ao programa Your Freedom. Com o µTorrent, eu fiz:
Options > Preferences > Connection > the second frame Proxy Server
Type: Socks4
Proxy: localhost
Port: 1080 (make sure to have "use proxy server for peer-to-peer connections" UNchecked)
Conecte sua liberdade e inicie seus torrents.
Nota do site da Your Freedom:
A rudimentary service is available for free. It will provide a bit more bandwidth than a modem connection and up to 3 hours of usage per day (1 hour continuously, up to 3 hours in any 24 hour interval, up to 9 hours in any week interval), and will probably be enough for all casual users -- it's certainly enough to visit blocked web pages and join chats, and if it suits your needs you are welcome to use it as much as you like.
For those who want more, upgrade packages are available. Please check out our Packages page for details. There are also upgrade vouchers available for those who don't want time based packages. Your bought packages and vouchers keep this service alive!