NirCmd - NirCmd is a small utility that allows you to do many useful tasks from command-line, without displaying any user interface: change your display settings, turn off your monitor, open the door of your CD-ROM drive, and more...

Zenity - Zenity is a tool that allows you to display GTK dialog boxes in commandline and shell scripts.

SBSettings - Access the important settings and functions of your jailbroken iPhone/iPod Touch directly on your...

Yad - Yad (yet another dialog) is a fork of Zenity with many improvements, such as custom buttons...

Batch MessageBox - Display message boxes from Windows batch files and command line programs.

Glade - Glade is a RAD tool to enable quick & easy development of user interfaces for the GTK+ toolkit...