dd is a Unix command line utility for copying data. ddpt adds features for efficiently copying large amounts of data to and from disks. Apart from accessing disks using traditional Unix read() and write() calls, ddpt can optionally use SCSI pass-through interfaces to send SCSI commands to perform a copy. In Linux, the pass-through can be used to send TRIM commands to SSDs. It is written for Linux with ports to FreeBSD, Solaris, and Windows.
MammothCopy is a simple, Java-based tool to copy large or many files from one computer on the Internet directly to another. This is also possible with tools like WinSCP and an SSH server, but those are too complex for normal users. MammothCopy is geared towards parents wanting to send photos to their kids, or professionals who want to transfer huge files (only limited to the receiving end’s hard disk space).