TUIpeer works with the TUIAWT Java package, and together they provide a TUI (Text User Interface) look and feel for Java 1.0 and 1.1 applications. In addition, it supports multiple instances of java.awt.Toolkit, a prerequisite for a multi-user JVM. TUIAWT works by sending peer commands and receiving user interface events to and from the remote peer program. Communication with the remote peer program takes place over a socket connection.
This is the old BSD tn3270 made to compile under Linux/GLIBC. It is not perfect and not being actively maintained. Also in the same directory is 3270v4.1 from CERN, made to compile under Linux/GLIBC, which looks nicer. If you are interested in these programs, you may also want to look at the Linux tn5250 project.
Gsh is a graphical shell. It integrates a terminal window, a normal shell, and various GUI components into a single package which allows easier and more powerful operations than you can have with a shell and terminal window seperately. Gsh is already fully functional, but there are many avenues of devlopment yet to be explored.