The octave-forge package is the result of The GNU Octave Repositry project,
which is intended to be a central location for custom scripts, functions and
extensions for GNU Octave. contains the source for all the functions plus
build and install scripts.

This is zenity.

 A set of functions for creating simple graphical
 user interfaces. It is currently possible to create
 calendar windows, text entries, file selection dialogs,
 lists, message windows, icons in the notification area,
 and windows for large amount of text.