postzilla is yet another multi-threaded downloader. It was created by me and Carlos (see Copyright) in 2005 as an alternative to prozilla, popular at the time. Due to its custom http implementation, prozilla used to have security wholes. By implementing a downloader using the python libraries, this risks were greatly reduced.
postzilla has a console UI. It is mostly functional and can download files over HTTP and FTP. The user can also specify user name and password in case authentication is required. Note that postzilla is not very tested and could have odd behaviors (nothing dangerous).
In case you want to find other multi-threaded downloaders, there are three I can think of: aria2, axel and, DownThemAll.
The code for postzilla is hosted in the savannah git server.
git clone git://github.com/useche/postzilla.git