Curl
Command line tool and library for transferring data with URLs
... equipment. Curl is also the internet transfer backbone for thousands of software applications being used extensively throughout the world today.
Curl is feature-rich, thread-safe, well supported and fast. It is also highly portable and works on numerous platforms, including Solaris, NetBSD, FreeBSD, OpenBSD, Linux, Mac OS X, Windows, Darwin, UnixWare, HURD, BeOS, Ultrix, QNX, DOS, Symbian, and many more.