BiglyBT - BiglyBT is a feature filled, open source, bittorrent client. Auto migrate from Vuze and Azureus. I2P integration, Swarm Merging, Advanced Tag System, WebTorrent support, built-in VPN kill switch, Meta-search, UPnP/DLNA access, and much more.
HTTrack - HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility.
rTorrent - rtorrent is a BitTorrent client for ncurses, using the libtorrent library.
WebCopy - Cyotek WebCopy is a free tool for copying full or partial websites locally onto your harddisk for offline viewing.
Nicotine+ - Nicotine+ is a graphical client for the Soulseek peer-to-peer network.
SiteSucker - SiteSucker is a Macintosh application that automatically downloads Web sites from the Internet.