x3270

x3270 is a free and open-source terminal emulator for the X Window System. It emulates IBM mainframe 3270 terminals, allowing users to connect to and interact with legacy mainframe applications from their Unix-like workstations. The project was originally developed by Paul Mattes and has since been maintained and expanded by a community of developers.

The emulator supports a variety of 3270 terminal types, including the 3278 and 3179. It provides features such as keyboard mapping, color support, and the ability to save and retrieve screen contents. x3270 can be used to access applications running on IBM z/OS, MVS, VM, VSE, and OS/390 operating systems. It connects to mainframes using the IBM Personal Communications (PCOM) emulator's protocol, often over TCP/IP networks.

Installation and configuration of x3270 are typically done through standard package managers on Linux and other Unix-like systems. Users configure connections by specifying the mainframe's host address and port. The program is known for its stability and reliability when interacting with mainframe environments. It is a valuable tool for system administrators, developers, and users who need to maintain or access legacy mainframe systems.