Finnix is a small, self-contained, bootable Linux CD distribution ("LiveCD") for system administrators, based on Debian testing. You can use it to mount and manipulate hard drives and partitions, monitor networks, rebuild boot records, install other operating systems, and much more.
GNUnet is a peer-to-peer framework with focus on providing security. All peer-to-peer messages in the network are confidential and authenticated. The framework provides a transport abstraction layer and can currently encapsulate the network traffic in UDP, TCP, HTTP, HTTPS, or direct 802.11 (WLAN). GNUnet supports accounting to provide contributing nodes with better service. The services built on top of the framework include anonymous file sharing and a virtual network providing IPv4-IPv6 transition via protocol translation over the P2P network.
SmbSync is a program to move files between Unix and Windows shares directly, avoiding the need for mounts or extra services like FTP or Rsync. It uses input and output directories, and can be configured to handle many directories and servers. It can retry uploads and downloads that fail, avoids incomplete file transfers, does not touch recently modified files with a configurable timeout, can archive files instead of deleting files transferred, can upload or download to temporary directories so that scripts that trigger on the files will only see complete files, and allows you to configure blocksize.
XTREEMFS is a distributed and replicated file system for the Internet. Clients and servers can be distributed world-wide. You can mount and access your files via the Internet from anywhere. You can easily replicate your files across data centers to reduce network consumption and latency and increase data availability.