Free p2p file sharing software for linux

Torrent Swapper is an open sourced sociable peer to peer file-sharing client based on the Bittorrent protocol that is ideal for high-speed distribution of large files that has a basic understanding of human friendships, of user tastes in content, and of Internet connectivity between users.
Torrent Swapper project supports simultaneous downloads, download queue, selected downloads in torrent package, fast-resume, speed limits, port mapping, disk cache, proxy, ip-filter, etc.
Main features:
- Amazon-like recommendations to get interesting files
- Doubling the download speed by using the upload capacity of friends
- Real-time P2P file sharing with P2P video streaming
- Showing the locations of seeders / leechers of the same content with city-level accuracy on a world map
- Multiple downloads in a single window
- Queueing system with priority
- Supporing pause, stop, resume, queue, remove operations
- Supporting global setting such as upload and download limiting
- Supporting local setting for each torrent as well
- And much more...

retroshare provides a private P2P file sharing software.
Retroshare is a cross-platform private P2P sharing program. It lets you share securely to your friends, using a web-of-trust to authenticate peers and OpenSSL to encrypt all communication. RetroShare provides filesharing, chat, messages, and channels.
Main features:
- A Private Peer to Peer Network which allows you to share information with only the people you want to.
- Reliable Identification and Authentication of your friends.
- Plus an Introduction Scheme which connects you to the friends of your friends, and facilitates network growth.
- Encrypted Communication, ensuring all shared information is known only to you and your peers.
- A Communication Platform which can potentially support services such as Secure Email, File Sharing, Video or Voice over IP and Messaging
- A Decentralised Social Sharing Network designed **For the People**
- with no dependancies on any corporate system or central servers.
Enhancements:
- First release with Web of Trust Authentication!
- Downloads are automatically resumed
- New Directory search interface.

Web Sharing is a small tray applet for sharing files on the web.

Publish anything on the Internet or your local area network at home, office or school from a folder on your hard disk with just a few clicks of a mouse!

MUTE File Sharing is a peer-to-peer network that provides easy search-and-download functionality while also protecting your privacy.
It compiles as a fast, native application for many platforms (no Java, no Python, etc.).
MUTE protects your privacy by avoiding direct connections with your sharing partners in the network. Most other file sharing programs use direct connections to download or upload, making your identity available to spies from the RIAA and other unscrupulous organizations.
MUTE is based on research, and experiments show that it works quite well. MUTEs ant-inspired routing is light-weight, robust, and adaptive. Results from experiments in real MUTE networks show that the collective behavior of MUTE nodes quickly finds the shortest (or fastest) routing path between two nodes on the network.
Enhancements:
- This release fixes bugs in MUTEs initial connection to the network upon startup.
- MUTE has also been upgraded to Crypto++ 5.4, so it should now compile using GCC 4.1.

Anatomic P2P is a BitTorrent Client written in GTK with an extension enabling decentralisation.

It is written in pygtk using the original core of BitTornado and it can access the Anatomic P2P network of supernodes and trackers so that files can be swarmed over multiple nodes on the network creating great efficiency.

P2P-Radio provides a peer-to-peer audio and video broadcasting system.
P2P-Radio is a peer-to-peer audio (MP3) and video (NSV) broadcasting system that features freeloader detection, stream signing, SHOUTcast support, an easy-to-use GUI, and a separate monitor application which displays the current structure of the P2P network.
P2P-Radio is programmed in Java and runs on Windows, Mac OS X, Linux and many other systems.
Main features:
- Easy to use (graphical user interface)
- You can play the music/video with your media player (i.e. Winamp)
- A Shoutcast/Icecast Internet radio/TV station is used as audio/video source
- Freeloaders (peers that only listen but dont want to send the stream to other listeners) will be detected
- The data stream is signed, you can be sure that it arrives unchanged
- Very efficient communication (low overhead)
- The network structure can be viewed with a monitor
Enhancements:
- Signing of streams has been turned off by default in order to save CPU time (enable it with the parameter "-sign")
- P2P-Radio will only cooperate with a monitor if it was started with the parameter "-enablemonitor"
- Two parameters control whether the media player will be started:
- startmediaplayer: Start the media player in broadcasting mode
- dontstartmediaplayer: Dont start the media player in listening mode