tn5250

tn5250j is a 5250 emulator written in Java.
tn5250 is a telnet client for the IBM iSeries and AS/400 that emulates 5250 terminals and printers.

This function is the same as that provided by the 5250 emulator in IBM iSeries Access.
x3270 implements the tn3270 protocol, which is very similar to tn5250.