x3270 is an IBM 3270 terminal emulator for the X Window System. Runs on most Unix-like operating systems [Gnu/Linux, Mac OS X, Solaris, Cygwin and also a TELNET connection], emulating either an IBM 3279 (color) or 3278 (monochrome).
Freeware terminal emulation and file transfer package, with scripting capabilities and multiple character sets, for modem, standard or secure TCP/IP, serial, DECnet, and NetBios connections.