mod_musicindex is an Apache module aimed at being a C alternative to the Perl module Apache::MP3. It allows nice displaying of directories containing MP3, Ogg Vorbis, FLAC, or MP4/AAC files, including sorting them on various fields, streaming/downloading them, constructing playlists, and searching. It also provides features such as RSS and Podcast feeds, multiple CSS support, and archive downloads.
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.
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.