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Zenity - Zenity is a tool that allows you to display GTK dialog boxes in commandline and shell scripts.
VisualWX - Visualwx aims to be the ultimate RAD tool, designed for c++, python, perl, ruby, lua and wxWidgets.
Yad - Yad (yet another dialog) is a fork of Zenity with many improvements, such as custom buttons...
Orwell Dev-C - The official site of the Bloodshed Dev-C++ update, which is fully portable, and optionally ships with a 64bit compiler.
Glade - Glade is a RAD tool to enable quick & easy development of user interfaces for the GTK+ toolkit...
wxDev-C++ - wxDev-C++ is an extension of Bloodshed Dev-C++ by Colin Laplace et. al.