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.

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