s3270

Program for scripted telnet sessions to IBM mainframes
  http://x3270.bgp.nu/
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S3270 opens a telnet connection to an IBM mainframe host, then allows a script to control the host login session.

s3270 implements RFCs 2355 (TN3270E), 1576 (TN3270), and 1646 (LU name selection), and supports IND$FILE file transfer.