brew tap Code-Hex/pget
brew install pget

$ go get github.com/Code-Hex/pget/cmd/pget

$ go get -u github.com/Code-Hex/pget/cmd/pget

% pget -p 6 URL 
% pget -p 6 MIRROR1 MIRROR2 MIRROR3

cat list.txt
MIRROR1
MIRROR2
MIRROR3

cat list.txt | pget -p 6

  Options:
  -h,  --help                   print usage and exit
  -v,  --version                display the version of pget and exit
  -p,  --procs <num>            split ratio to download file
  -o,  --output <filename>      output file to <filename>
  -d,  --target-dir <path>      path to the directory to save the downloaded file, filename will be taken from url
  -t,  --timeout <seconds>      timeout of checking request in seconds
  -u,  --user-agent <agent>     identify as <agent>
  -r,  --referer <referer>      identify as <referer>
  --check-update                check if there is update available
  --trace                       display detail error messages

time wget http://ubuntutym2.u-toyama.ac.jp/ubuntu/16.04/ubuntu-16.04-desktop-amd64.iso
time pget -p 6 http://ubuntutym2.u-toyama.ac.jp/ubuntu/16.04/ubuntu-16.04-desktop-amd64.iso

wget   3.92s user 23.52s system 3% cpu 13:35.24 total
pget -p 6   10.54s user 34.52s system 25% cpu 2:56.93 total