Retroshare 0.5

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.

Main Features:
- 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