"RetroShare is a Open Source cross-platform, private and secure decentralised communication platform.
It lets you to securely chat and share files with your friends and family, using a web-of-trust to authenticate peers and OpenSSL to encrypt all communication.
RetroShare provides filesharing, chat, messages, forums and channels
- Serverless, encrypted Chat & Filetransfer
- Multiple simultaneous downloads / uploads
- Search Friends
- UPnP / NAT-PMP port forwarding support
- GnuPG Authentication
- OpenSSL Encryption
- Plugins support
- Graphical User Interface written with Qt4 toolkit
- System tray integration." --Retroshare