FDT is an application for efficient data transfers that is capable of reading and writing at disk speed over wide area networks (with standard TCP). It can be used to stream a large set of files across the network, so a large dataset composed of thousands of files can be sent or received at full speed, without the network transfer restarting between files. It is written in Java, runs an all major platforms, and is easy to use.
The MAD project is an implementation of the FLUTE (File Delivery over Unidirectional Transport) protocol for the unidirectional delivery of files over the Internet over a multicast network. FLUTE builds on Asyncronous Layered Coding, which itself is a combination of Layered Coding Transport (LCT), Forward Error Correction (FEC), and multiple rate congestion control elements. The project provides a number of libraries providing the networking and error-correction layers and a file transfer tool that is built on top of them.
uTorrent.py is a Python module for accessing the interface exposed by the uTorrent Web UI. Current features include getting and setting uTorrent parameters, viewing information and statistics on torrents and files, and setting torrent state and file priorities. Small example utilities are included. Note that the download file is a 7zip archive, not a PNG image.