Zenity - Zenity is a tool that allows you to display GTK dialog boxes in commandline and shell scripts.
Yad - Yad (yet another dialog) is a fork of Zenity with many improvements, such as custom buttons...
AutoHotkey - The ultimate automation scripting language for Windows.
Glade - Glade is a RAD tool to enable quick & easy development of user interfaces for the GTK+ toolkit...
Batch MessageBox - Display message boxes from Windows batch files and command line programs.
wxSmith - wxSmith is a ...