Comment by blues

You might be interested in SourceForge's RetroShare. Direct encrypted Internet communication of all kinds between computers with no intermediate hosts.

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Serverless, encrypted Chat & Filetransfer

Multiple simultaneous downloads / uploads

Search Friends

Messages

Forums

UPnP / NAT-PMP port forwarding support

GnuPG Authentication

OpenSSL Encryption

Plugins support

Graphical User Interface written with Qt4 toolkit

System tray integration

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http://retroshare.sourceforge.net/