Retroshare is a private and secure decentralised commmunication platform. It lets you share securely your friends, using a web-of-trust to authenticate peers and OpenSSL to encrypt all communication. RetroShare provides filesharing, chat, messages and channels.
Retroshare is a cross-platform private P2P sharing program.

RetroShare features:
1. Graphical User Interface written with Qt4.2
2. UPnP / NAT-PMP port forwarding support
3. OpenSSL Encryption
4. Encrypted Chat & Filetransfer
5. Multiple simultaneous downloads / uploads
6. Search Friends
7. DHT support
8. Instant Chat Messaging

The license of this software is Free, you can free download and free use this file sharing software.