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.

RetroShare is the next generation sharing network, which provides a reliable Identification and Authentication of your friends, plus an Introduction Scheme which connects you to the friends of your friends, and facilitates network growth.

RetroShare features Encrypted Communication, ensuring all shared information is known only to you and your peers.
This Communication Platform can potentially support services such as Secure Email, File Sharing, Streaming, Video or Voice over IP, Photos, Wall and Messaging

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