The comms/lrzsz port
lrzsz-0.12.20p2 – receive/send files via X/Y/ZMODEM protocol
This program uses error correcting protocols to send/receive
files over a dial-in serial port from a variety of programs
running under PC-DOS, CP/M, Unix, and other operating systems.
lrzsz is derived from the last unrestricted version of Chuck Forsberg's
rzsz package. lrzsz is covered under the GNU copyleft.