Sumit Dhar links me to Filetopia which and sumit says that it is a firewall friendly P2P program.
“Filetopia is a free communications software that includes: instant messaging, chat, a powerful file sharing system with a search engine, online friends list and message boards.
What is unique to this software is the level of security and privacy that it provides. It uses a choice of strong ciphers and public key techniques for all communications and sophisticated techniques to protect your IP and thus make you truly anonymous and safe from attacks.”
Will have to give it a try sometime just to check the security.
Tejas Patel
Update:- Updated Sumit's blog link.