HTTrack - HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility.
qBittorrent - Lightweight and open source torrent client that runs on all major platforms.
GNU Wget - GNU Wget is a free software package for retrieving files using HTTP(S) and FTP, the most...
Deluge - Deluge is a full-featured BitTorrent client for Linux, Unix and Windows.
SiteSucker - SiteSucker is a Macintosh application that automatically downloads Web sites from the Internet.
BitTorrent - BitTorrent is a peer-to-peer program developed by Bram Cohen and BitTorrent, Inc.