Tn5250
From MidrangeWiki
tn5250 is a 5250 emulator that runs on several platforms. tn5250 has several front ends, each appropriate for a given platform. The tn5250 project also produces lib5250, a backend used by several emulators that provides the 5250 host communication.
There is extensive documentation for tn5250 in the tn5250 HOWTO.
tn5250 is licensed under the LGPL license.