wxDev-C++
Zenity
Yad
Glade
wxFormBuilder
Modern Message Box Generator
easybashgui
wxSmith
Vim Python IDE
wxDev-C++
Vim Python IDENo features have been listed yet.
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...
Glade - Glade is a RAD tool to enable quick & easy development of user interfaces for the GTK+ toolkit...
wxFormBuilder - wxWidgets is an excellent framework that enables the creation of multi-platform applications with...
Modern Message Box Generator - Generates a customizable "Task Dialog" box - a more modern version of the old Windows message box.'
easybashgui - EasyBashGUI is a bash function library that aims to give scripters simple GUI functions