GNU Wget is a utility for noninteractive download of
files from the Web. It supports HTTP and FTP
protocols, as well as retrieval through HTTP
proxies. It can follow HTML links, download many
pages, and convert the links for local viewing. It
can also mirror FTP hierarchies or only those files
that have changed. Wget has been designed for
robustness over slow network connections; if a
download fails due to a network problem, it will
keep retrying until the whole file has been
retrieved.