TFTP, or Trivial File Transfer Protocol, is a simple method used to
transfer files from point A to point B. Unlike FTP, it does not
include facilities for browsing directories, creating folders,
authenticating users, etc. These days, its primary use is to transfer
files to devices, such as routers, as a means of updating those
devices.
MacTFTP Client is the first complete TFTP client implementation for
the Mac. It allows you to send or receive files from a TFTP server,
perform multiple simultaneous transfers, etc.