it is a very small wget without the most fancy features ;)

BusyBox v1.7.2 (2012-08-23 11:13:41 HKT) multi-call binary

Usage: wget [-c|--continue] [-s|--spider] [-q|--quiet] [-O|--output-document file]
                [--header 'header: value'] [-Y|--proxy on/off] [-P DIR]
                [-U|--user-agent agent] url

Retrieve files via HTTP or FTP

Options:
        -s      Spider mode - only check file existence
        -c      Continue retrieval of aborted transfer
        -q      Quiet
        -P      Set directory prefix to DIR
        -O      Save to filename ('-' for stdout)
        -U      Adjust 'User-Agent' field
        -Y      Use proxy ('on' or 'off')