File sharing

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DCC

https://en.wikipedia.org/wiki/Direct_Client-to-Client

To sort

http://en.wikipedia.org/wiki/Unison_(file_synchronizer)

http://fak3r.com/2009/09/14/howto-build-your-own-open-source-dropbox-clone/ - lsyncd

https://github.com/hollow/inosync

http://sourceforge.net/projects/ifolder

https://github.com/WhatCD/Gazelle

Private P2P
https://secure.wikimedia.org/wikipedia/en/wiki/Friend-to-friend Friend-to-friend]
http://streisand.me/egyptVideos.php

https://help.ubuntu.com/community/MLDonkey

Anonymous/encrypted

https://en.wikipedia.org/wiki/Deep_Web - sites/services on tor/i2p, etc.
https://en.wikipedia.org/wiki/Darknet_(file_sharing) - WASTE, Freenet, etc.

WASTE is an anonymous, secure, and encryped collaboration tool which allows users to both share ideas through the chat interface and share data through the download system.
- https://en.wikipedia.org/wiki/WASTE

Freenet - Share files, chat on forums, browse and publish, anonymously and without fear of blocking or censorship! While users can insert data into the network, there is no way to delete data. Due to the anonymity, no node knows who is the 'owner' of a piece of data. The only way data can be removed is if users don't request the data.
- https://en.wikipedia.org/wiki/Freenet
- http://jtcfrost.sourceforge.net/

RetroShare is a Open Source cross-platform, Friend-2-Friend 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
- https://retroshareteam.wordpress.com/

MUTE File Sharing is a peer-to-peer network that provides easy search-and-download functionality while also protecting your privacy.
- https://secure.wikimedia.org/wikipedia/en/wiki/Mute-Net

OneSwarm is a P2P file sharing service that protects your privacy. It's fast, BitTorrent-compatible, and free!
- https://en.wikipedia.org/wiki/Oneswarm

OFF is a highly connected peer-to-peer distributed file system. The unique feature of this system is that it stores all of its internal data as meaningless multi-use data blocks. In other words there is not a one to one mapping between a stored block and its use in a accessed file. Each stored block is simultaneously used to access many different files. Individually however, each block is nothing but arbitrary digital white noise.
- https://en.wikipedia.org/wiki/OFFSystem

Free Haven Project aims to deploy a system for distributed, anonymous, persistent data storage which is robust against attempts by powerful adversaries to find and destroy any stored data. This model of decentralized system has been classified as peer-to-peer by recent popular media.

Tahoe-LAFS is a Free and Open cloud storage system. It distributes your data across multiple servers. Even if some of the servers fail or are taken over by an attacker, the entire filesystem continues to function correctly, preserving your privacy and security.