qBittorrent - Lightweight and open source torrent client that runs on all major platforms.
HTTrack - HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility.
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.
µTorrent - Looking for a torrent site to download movies, music and more? Choose from top torrent sites like The Pirate Bay, RARBG, 1337X, and dozens more. (October 2019)
WebCopy - Cyotek WebCopy is a free tool for copying full or partial websites locally onto your harddisk for offline viewing.