The Model Operations Processing System (MOPS) has been designed to assist operations on model railroads. It has the look and feel of mainframe systems that would have been in used in the late 20th century.
A MUD-Client for Windows (Win32) and KDE, featuring perl, python and ruby scripting, as well as multi-window output. The main focus is a very strong scripting engine (nearly everything is accessible from a script) while trying to stay user friendly.