​​aria2

aria2 is an ultra—fast download utility for downloading files.

Supported protocols: HTTP(S), FTP, SFTP, BitTorrent and Metalink. 

aria2 can download a file from multiple sources/protocols and tries to use the maximum download bandwidth.

▫command line interface
▫support http, https, ftp proxy
▫cookie support
▫selective loading in a multi-file torrent
▫IPv6 support
and much more...

Documentation: